CN114395249A - High-oxygen-index polyamide composition and preparation method and application thereof - Google Patents
High-oxygen-index polyamide composition and preparation method and application thereof Download PDFInfo
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- CN114395249A CN114395249A CN202210074671.7A CN202210074671A CN114395249A CN 114395249 A CN114395249 A CN 114395249A CN 202210074671 A CN202210074671 A CN 202210074671A CN 114395249 A CN114395249 A CN 114395249A
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- 239000004952 Polyamide Substances 0.000 title claims abstract description 34
- 229920002647 polyamide Polymers 0.000 title claims abstract description 34
- 239000000203 mixture Substances 0.000 title claims abstract description 32
- 238000002360 preparation method Methods 0.000 title claims abstract description 10
- 229910052760 oxygen Inorganic materials 0.000 claims abstract description 42
- 239000001301 oxygen Substances 0.000 claims abstract description 42
- QVGXLLKOCUKJST-UHFFFAOYSA-N atomic oxygen Chemical compound [O] QVGXLLKOCUKJST-UHFFFAOYSA-N 0.000 claims abstract description 40
- NSBGJRFJIJFMGW-UHFFFAOYSA-N trisodium;stiborate Chemical group [Na+].[Na+].[Na+].[O-][Sb]([O-])([O-])=O NSBGJRFJIJFMGW-UHFFFAOYSA-N 0.000 claims abstract description 28
- RNFJDJUURJAICM-UHFFFAOYSA-N 2,2,4,4,6,6-hexaphenoxy-1,3,5-triaza-2$l^{5},4$l^{5},6$l^{5}-triphosphacyclohexa-1,3,5-triene Chemical compound N=1P(OC=2C=CC=CC=2)(OC=2C=CC=CC=2)=NP(OC=2C=CC=CC=2)(OC=2C=CC=CC=2)=NP=1(OC=1C=CC=CC=1)OC1=CC=CC=C1 RNFJDJUURJAICM-UHFFFAOYSA-N 0.000 claims abstract description 25
- 229910021589 Copper(I) bromide Inorganic materials 0.000 claims abstract description 25
- NKNDPYCGAZPOFS-UHFFFAOYSA-M copper(i) bromide Chemical compound Br[Cu] NKNDPYCGAZPOFS-UHFFFAOYSA-M 0.000 claims abstract description 25
- 239000003063 flame retardant Substances 0.000 claims abstract description 25
- ZQKXQUJXLSSJCH-UHFFFAOYSA-N melamine cyanurate Chemical compound NC1=NC(N)=NC(N)=N1.O=C1NC(=O)NC(=O)N1 ZQKXQUJXLSSJCH-UHFFFAOYSA-N 0.000 claims abstract description 25
- 239000003365 glass fiber Substances 0.000 claims abstract description 12
- 239000004953 Aliphatic polyamide Substances 0.000 claims abstract description 11
- 229920003231 aliphatic polyamide Polymers 0.000 claims abstract description 11
- 229920005989 resin Polymers 0.000 claims abstract description 11
- 239000011347 resin Substances 0.000 claims abstract description 11
- 229920002302 Nylon 6,6 Polymers 0.000 claims description 6
- 238000002156 mixing Methods 0.000 claims description 6
- 229920002292 Nylon 6 Polymers 0.000 claims description 5
- 238000000034 method Methods 0.000 claims description 5
- 230000004048 modification Effects 0.000 claims description 5
- 238000012986 modification Methods 0.000 claims description 5
- 239000002245 particle Substances 0.000 claims description 5
- 239000012752 auxiliary agent Substances 0.000 claims description 4
- 239000000155 melt Substances 0.000 claims description 4
- 229920002635 polyurethane Polymers 0.000 claims description 4
- 239000004814 polyurethane Substances 0.000 claims description 4
- 239000003963 antioxidant agent Substances 0.000 claims description 3
- 230000003078 antioxidant effect Effects 0.000 claims description 3
- 239000000314 lubricant Substances 0.000 claims description 3
- 238000005303 weighing Methods 0.000 claims description 3
- 239000000463 material Substances 0.000 abstract description 14
- 229920001778 nylon Polymers 0.000 abstract description 13
- 239000004677 Nylon Substances 0.000 abstract description 12
- 238000001125 extrusion Methods 0.000 abstract 1
- 230000000052 comparative effect Effects 0.000 description 18
- 229920006122 polyamide resin Polymers 0.000 description 14
- 238000012360 testing method Methods 0.000 description 11
- 230000032683 aging Effects 0.000 description 5
- 239000002131 composite material Substances 0.000 description 5
- 239000002994 raw material Substances 0.000 description 5
- 229910052787 antimony Inorganic materials 0.000 description 4
- 238000002485 combustion reaction Methods 0.000 description 4
- 230000000694 effects Effects 0.000 description 4
- 229920006351 engineering plastic Polymers 0.000 description 4
- 239000000126 substance Substances 0.000 description 4
- BZQKBFHEWDPQHD-UHFFFAOYSA-N 1,2,3,4,5-pentabromo-6-[2-(2,3,4,5,6-pentabromophenyl)ethyl]benzene Chemical compound BrC1=C(Br)C(Br)=C(Br)C(Br)=C1CCC1=C(Br)C(Br)=C(Br)C(Br)=C1Br BZQKBFHEWDPQHD-UHFFFAOYSA-N 0.000 description 3
- 230000014759 maintenance of location Effects 0.000 description 3
- 229920000642 polymer Polymers 0.000 description 3
- 238000004381 surface treatment Methods 0.000 description 3
- KXDHJXZQYSOELW-UHFFFAOYSA-N Carbamic acid Chemical compound NC(O)=O KXDHJXZQYSOELW-UHFFFAOYSA-N 0.000 description 2
- WATWJIUSRGPENY-UHFFFAOYSA-N antimony atom Chemical compound [Sb] WATWJIUSRGPENY-UHFFFAOYSA-N 0.000 description 2
- -1 antimony halide Chemical class 0.000 description 2
- 238000006243 chemical reaction Methods 0.000 description 2
- 238000009833 condensation Methods 0.000 description 2
- 238000007334 copolymerization reaction Methods 0.000 description 2
- 150000004985 diamines Chemical class 0.000 description 2
- 238000007865 diluting Methods 0.000 description 2
- 230000007613 environmental effect Effects 0.000 description 2
- 239000003822 epoxy resin Substances 0.000 description 2
- 239000007789 gas Substances 0.000 description 2
- 230000006872 improvement Effects 0.000 description 2
- 239000011261 inert gas Substances 0.000 description 2
- 150000003951 lactams Chemical class 0.000 description 2
- 238000006068 polycondensation reaction Methods 0.000 description 2
- 229920000647 polyepoxide Polymers 0.000 description 2
- 238000011160 research Methods 0.000 description 2
- 238000007151 ring opening polymerisation reaction Methods 0.000 description 2
- 239000000243 solution Substances 0.000 description 2
- 238000010998 test method Methods 0.000 description 2
- OKOBUGCCXMIKDM-UHFFFAOYSA-N Irganox 1098 Chemical compound CC(C)(C)C1=C(O)C(C(C)(C)C)=CC(CCC(=O)NCCCCCCNC(=O)CCC=2C=C(C(O)=C(C=2)C(C)(C)C)C(C)(C)C)=C1 OKOBUGCCXMIKDM-UHFFFAOYSA-N 0.000 description 1
- OFOBLEOULBTSOW-UHFFFAOYSA-N Malonic acid Chemical compound OC(=O)CC(O)=O OFOBLEOULBTSOW-UHFFFAOYSA-N 0.000 description 1
- GWFGDXZQZYMSMJ-UHFFFAOYSA-N Octadecansaeure-heptadecylester Natural products CCCCCCCCCCCCCCCCCOC(=O)CCCCCCCCCCCCCCCCC GWFGDXZQZYMSMJ-UHFFFAOYSA-N 0.000 description 1
- 230000009471 action Effects 0.000 description 1
- CJZGTCYPCWQAJB-UHFFFAOYSA-L calcium stearate Chemical class [Ca+2].CCCCCCCCCCCCCCCCCC([O-])=O.CCCCCCCCCCCCCCCCCC([O-])=O CJZGTCYPCWQAJB-UHFFFAOYSA-L 0.000 description 1
- 239000003153 chemical reaction reagent Substances 0.000 description 1
- 238000013329 compounding Methods 0.000 description 1
- 230000007547 defect Effects 0.000 description 1
- 238000013461 design Methods 0.000 description 1
- 150000001991 dicarboxylic acids Chemical class 0.000 description 1
- 150000002148 esters Chemical class 0.000 description 1
- 230000002349 favourable effect Effects 0.000 description 1
- 239000000835 fiber Substances 0.000 description 1
- 239000012847 fine chemical Substances 0.000 description 1
- 230000008676 import Effects 0.000 description 1
- 238000002347 injection Methods 0.000 description 1
- 239000007924 injection Substances 0.000 description 1
- 238000001746 injection moulding Methods 0.000 description 1
- 229910052751 metal Inorganic materials 0.000 description 1
- 239000002184 metal Substances 0.000 description 1
- 150000002739 metals Chemical class 0.000 description 1
- 239000000178 monomer Substances 0.000 description 1
- NKBWPOSQERPBFI-UHFFFAOYSA-N octadecyl octadecanoate Chemical compound CCCCCCCCCCCCCCCCCCOC(=O)CCCCCCCCCCCCCCCCC NKBWPOSQERPBFI-UHFFFAOYSA-N 0.000 description 1
- 238000011056 performance test Methods 0.000 description 1
- 150000002989 phenols Chemical class 0.000 description 1
- 230000035939 shock Effects 0.000 description 1
- 239000007858 starting material Substances 0.000 description 1
- 239000004575 stone Substances 0.000 description 1
- 230000002195 synergetic effect Effects 0.000 description 1
- 229920002994 synthetic fiber Polymers 0.000 description 1
- 239000012209 synthetic fiber Substances 0.000 description 1
- 229920001169 thermoplastic Polymers 0.000 description 1
- 239000004416 thermosoftening plastic Substances 0.000 description 1
Classifications
-
- 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
- C08K5/16—Nitrogen-containing compounds
- C08K5/34—Heterocyclic compounds having nitrogen in the ring
- C08K5/3467—Heterocyclic compounds having nitrogen in the ring having more than two nitrogen atoms in the ring
- C08K5/3477—Six-membered rings
- C08K5/3492—Triazines
- C08K5/34928—Salts
-
- 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
- C08K3/16—Halogen-containing compounds
-
- 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
- C08K3/24—Acids; Salts thereof
-
- C—CHEMISTRY; METALLURGY
- C08—ORGANIC MACROMOLECULAR COMPOUNDS; THEIR PREPARATION OR CHEMICAL WORKING-UP; COMPOSITIONS BASED THEREON
- C08L—COMPOSITIONS OF MACROMOLECULAR COMPOUNDS
- C08L2201/00—Properties
- C08L2201/02—Flame or fire retardant/resistant
Landscapes
- Chemical & Material Sciences (AREA)
- Health & Medical Sciences (AREA)
- Chemical Kinetics & Catalysis (AREA)
- Medicinal Chemistry (AREA)
- Polymers & Plastics (AREA)
- Organic Chemistry (AREA)
- Compositions Of Macromolecular Compounds (AREA)
Abstract
The invention discloses a high-oxygen-index polyamide composition and a preparation method and application thereof. The high oxygen index polyamide composition comprises the following components: 38-90 parts of aliphatic polyamide resin, 5-40 parts of glass fiber, 5-25 parts of main flame retardant (melamine cyanurate), 2.2-10 parts of auxiliary flame retardant, wherein the auxiliary flame retardant is a composition of sodium antimonate and cuprous bromide. Wherein, 0.5 to 8 weight portions of sodium antimonate and 1.7 to 2 weight portions of cuprous bromide. The modified nylon product has the advantages that MCA, sodium antimonate and cuprous bromide are added and blended with the nylon product for extrusion, the problem of low oxygen index performance of the modified nylon product is successfully solved, the oxygen index can reach 35.8, the overall mechanical property and flame retardant performance of the material are improved, the modified nylon product can be applied to the field of mature low-voltage appliances, can also be applied to the connector industry with higher requirements on flame retardant and mechanical property, is particularly suitable for the field of rail transit, and can meet the EN45545HL3 grade of the rail transit industry.
Description
Technical Field
The invention relates to the technical field of engineering plastics, in particular to the field of modified nylon composite materials, and specifically relates to a high-oxygen-index polyamide composition, and a preparation method and application thereof.
Background
Polyamides, also known as nylons, are the earliest synthetic fibers developed, both as fibers and as engineering plastics. Nylon is widely applied to the fields of industry, clothing, engineering plastics and the like due to good comprehensive properties of nylon, such as high strength, good rigidity, shock resistance, oil resistance, chemicals, wear resistance, good self-lubricating property and the like, easily available raw materials and low cost. The nylon material after being reinforced and flame-retardant and modified by the glass fiber has higher mechanical strength and better flame retardance, and can replace some metals and other thermoplastic engineering plastics in the aspect of electronic and electric appliance application.
With the increasing emphasis on the environmental protection of products, halogen-free environment-friendly flame retardant materials have become a hotspot of research, and the high requirement that the oxygen index is more than or equal to 32 percent is provided for electrical products applied in extreme environments. At present, a series of import restrictions are set up in developed countries, the requirements on environmental protection of electronic and electric products are halogen-free, and the requirements on oxygen index must be met at the same time. In the prior art, the oxygen index of nylon can reach 32, but the improvement of the oxygen index above 32 is very difficult, and the requirement of the grade EN45545HL3 in the rail transit industry is difficult, so that a polyamide resin with a higher oxygen index and good integral mechanical property and flame retardant performance is urgently needed.
Disclosure of Invention
Aiming at the defects in the prior art, the invention provides a high-oxygen-index polyamide composition and a preparation method and application thereof.
The invention provides a high-oxygen-index polyamide composition, which comprises the following components:
the main flame retardant is melamine cyanurate, and the auxiliary flame retardant is a composition of sodium antimonate and cuprous bromide; 0.5-8 parts by weight of sodium antimonate; 1.7-2 parts by weight of cuprous bromide.
Further, the aliphatic polyamide resin is 54 to 80 parts by weight; the glass fiber accounts for 20-35 parts by weight; 6-15 parts by weight of melamine cyanurate; 5-8 parts of sodium antimonate; 1.8-2 parts of cuprous bromide.
Further, the aliphatic polyamide resin has a melt relative viscosity of 2.0 to 2.8. The test standard for relative viscosity refers to ISO 307-2007. The melt viscosity of the aliphatic polyamide resin is thinner when the melt relative viscosity is low, and the flame retardance is more favorable.
Furthermore, the surface treatment mode of the glass fiber is polyurethane modification. The flame retardant effect of polyurethane is superior to that of epoxy resin.
Further, the particle size D50 of the melamine cyanurate is less than 5 μm. The smaller the particle size, the better the dispersibility of the melamine cyanurate.
Further, the aliphatic polyamide resin is a polyamide resin of a polymer having an amide bond in a main chain.
Further, the polyamide resin of the polymer having an amide bond in the main chain is any one or more of a polyamide resin obtained by polycondensation of a diamine and a dicarboxylic acid, a polyamide resin obtained by ring-opening polymerization of a lactam, a polyamide resin obtained by self-condensation of an aminocarboxylic acid, and a polyamide copolymer obtained by copolymerization of two or more units constituting the polyamide resin.
Further, the aliphatic polyamide resin is nylon 6 or nylon 66.
Further, the high oxygen index polyamide composition also comprises other auxiliary agents. The auxiliary agent is 0.1-1 weight part.
Further, the auxiliary agent is one or two of an antioxidant and a lubricant. The antioxidant comprises hindered phenol compounds, and the lubricant comprises esters or stearates.
The invention also provides a preparation method of the high-oxygen-index polyamide composition, which comprises the following steps: weighing the components in parts by weight, and putting the components into a mixer for mixing until the components are uniform to obtain a premix; then putting the obtained premix into a double-screw extruder for melt mixing, and extruding and granulating to obtain the high-oxygen polyamide composition; wherein the length-diameter ratio of a screw of the double-screw extruder is 40-48: 1, the temperature of a screw cylinder is 200-275 ℃, and the rotating speed of the screw is 250-500 rpm.
The invention also provides application of the high-oxygen-index polyamide composition in preparation of low-voltage electric appliances, connectors and rail transit appliances.
In summary, compared with the prior art, the invention achieves the following technical effects:
1. according to the invention, a small amount of MCA, sodium antimonate and cuprous bromide are added to be blended and extruded with the nylon product, so that the problem of low oxygen index performance of the modified nylon product is successfully solved, the oxygen index can reach 35.8 and can reach more than 32, the mechanical properties before and after aging are improved, and the overall mechanical properties and flame retardant performance of the material are improved.
2. The high-oxygen-index polyamide composition disclosed by the invention can be applied to the field of mature low-voltage electrical appliances, can also be applied to the connector industry with higher requirements on flame retardance and mechanical properties, is particularly suitable for the field of rail transit, and can meet the EN45545HL3 grade of the rail transit industry.
Detailed Description
In order to make the technical solutions of the present invention better understood by those skilled in the art, the technical solutions in the embodiments of the present invention will be clearly and completely described below, and it is obvious that the described embodiments are only a part of the embodiments of the present invention, and not all embodiments. All other embodiments, which can be obtained by a person skilled in the art without any inventive step based on the embodiments of the present invention, shall fall within the scope of protection of the present invention.
The high-oxygen-index polyamide composition is added with melamine cyanurate, sodium antimonate and cuprous bromide, wherein the melamine cyanurate has the main function of generating inert gas in the combustion process and diluting the proportion of combustible gas; after the sodium antimonate component is introduced on the basis of the melamine cyanurate, antimony halide or antimony oxyhalide is formed during combustion and can cover the surface of combustible materials to isolate external heat and oxygen to a certain extent, thereby improving the oxygen index effect of the material. When a certain amount of cuprous bromide is compounded, cuprous bromide can react with sodium antimonate when the material is heated and decomposed, so that the forward reaction of the sodium antimonate is promoted, and the flame retardant efficiency of the material is further improved.
The aliphatic polyamide resin is a polyamide resin of a polymer having an amide bond (-NHCO-) in the main chain. Including but not limited to the following: polyamide resins obtained by polycondensation of diamines and dicarboxylic acids, polyamide resins obtained by ring-opening polymerization of lactams, polyamide resins obtained by self-condensation of aminocarboxylic acids, and polyamide copolymers obtained by copolymerization of two or more units (monomers) constituting these polyamide resins. In the present invention, the polyamide resin may be used alone or in combination of two or more kinds thereof. Nylon 6 or nylon 66 is preferred.
Example 1
The present invention will be further illustrated by the following specific examples and comparative examples, which are preferred embodiments of the present invention, but the present invention is not limited to the following examples, and is not particularly limited to the types of raw materials of the components used in the following specific examples.
The starting materials in the examples and comparative examples are commercially available as follows:
a1: nylon 66, relative viscosity 2.63, trade mark PA66 EP-158, Zhejiang Huafeng group;
a2: nylon 6, relative viscosity 2.52, designation PA6 HY-2500A, Jiangsu Haiyang chemical fibers Co., Ltd;
a3, nylon 66, relative viscosity 3.1, trade mark PA 66T 31, Zhejiang Huafeng group;
b1: glass fiber, namely glass fiber ECS10-03-568H, and the surface treatment mode is polyurethane modification and giant stone glass fiber;
b2: glass fiber, glass fiber ECS301HP-3-H, surface treatment mode is epoxy resin modification, Chongqing International composite materials GmbH;
c1: melamine Cyanurate (MCA) with a particle size D50 of 2.4 μm, Melamine Cyanurate (MCA), flame retardant from Shouguangdong chemical Co., Ltd;
c2: melamine Cyanurate (MCA), the particle size D50 is 15 μm, MCA-01, Sichuan province fine chemical research and design institute;
d: sodium antimonate, brand SA-F, Chengdu all pioneer high energy chemical industry Co., Ltd;
e: n, N' -bis- (3- (3, 5-di-tert-butyl-4-hydroxyphenyl) propionyl) hexanediamine, trade name IRGANOX 1098, basf;
f: stearyl stearate, trade mark LOXIOL G32, german konin;
g: cuprous bromide, designation DSUNSORB 3235H, disheng chemical;
h: decabromodiphenylethane, trade name SAYTEX 8010, yabao corporation, usa.
Reagents, methods and apparatus used in the present invention are conventional in the art unless otherwise indicated.
Weighing the raw materials according to the formula dosage of specific examples 1-15 in table 1 and comparative examples 1-6 in table 2, and putting the raw materials into a mixer for mixing until the raw materials are uniform to obtain a premix; then putting the obtained premix into a double-screw extruder for melt mixing, and extruding and granulating to obtain the high-oxygen-index polyamide composite material; wherein the length-diameter ratio of a screw of the double-screw extruder is 40-48: 1, the temperature of a screw cylinder is 200-275 ℃, and the rotating speed of the screw is 250-500 rpm. The polyamide resins prepared in examples 1 to 15 and comparative examples 1 to 6 were tested for oxygen index, tensile strength, and mechanical property retention rate after aging, respectively. The test results are shown in tables 3 and 4, respectively.
The performance test method comprises the following steps:
(1) oxygen index test method: according to the national standard GB/T2406.2: 2009, an oxygen index sample strip with the thickness of 120 x 10 x 4.0mm is formed by injection molding, and the Limit Oxygen Index (LOI) of the material formula is found by adopting a method for gradually increasing the oxygen concentration;
(2) tensile strength test method: ISO 527-1:2012, 10mm/min, the injection molded bars were left to cool for 2h before testing.
(3) The method for testing the mechanical property after aging comprises the following steps: and (4) testing the tensile strength after aging for 1000h at 180 ℃, and calculating the performance retention rate.
TABLE 1 proportions (parts by weight) of the components of the examples
TABLE 2 proportions (parts by weight) of the components of the comparative examples
Table 3 results of performance testing of examples
Table 4 results of performance testing of comparative examples
In the above comparative examples, the control of comparative example 1 was based on example 1, the control of comparative example 2 was based on example 2, and both comparative example 1 and comparative example 2 were blank tests of sodium antimonate and cuprous bromide, indicating that a higher oxygen index could not be achieved in the absence of sodium antimonate and cuprous bromide. The control bases of comparative examples 3-6 are all example 1, and comparative example 3 is a single blank control test of cuprous bromide, which shows that a higher oxygen index cannot be achieved in the absence of cuprous bromide alone. Comparative example 4 is a single blank test of sodium antimonate and illustrates that a higher oxygen index cannot be achieved in the absence of sodium antimonate alone. The flame retardant of comparative example 5 was only the primary flame retardant MCA. The flame retardant of comparative example 6 was a combination of decabromodiphenylethane and sodium antimonate. The results of the above comparative examples show that MCA, sodium antimonate and cuprous bromide of the invention have a compounding synergistic effect, and the combined action of the MCA, the sodium antimonate and the cuprous bromide can improve the oxygen index of the polyamide composition, so that the oxygen index can reach more than 35.
Based on the test data of the oxygen index, the tensile strength and the mechanical property retention rate after aging in table 3, the limit oxygen index of the polyamide composite material prepared in the embodiments 1 to 15 can be up to 35.8 on the premise that the tensile strength meets the conditions, and compared with a comparative example, the polyamide composite material has obvious advantages and can effectively meet the high standard requirements of customers and markets.
In conclusion, the invention discloses a high-oxygen-index polyamide composition, and a preparation method and application thereof. The high oxygen index polyamide composition comprises the following components: 38-90 parts of aliphatic polyamide resin, 5-40 parts of glass fiber, 5-25 parts of main flame retardant (melamine cyanurate), 2.2-10 parts of auxiliary flame retardant, wherein the auxiliary flame retardant is a composition of sodium antimonate and cuprous bromide. Wherein, 0.5 to 8 weight portions of sodium antimonate and 1.7 to 2 weight portions of cuprous bromide. The high-oxygen-index polyamide composition is added with melamine cyanurate, sodium antimonate and cuprous bromide, wherein the melamine cyanurate has the main function of generating inert gas in the combustion process and diluting the proportion of combustible gas; after the sodium antimonate component is introduced on the basis of the melamine cyanurate, antimony halide or antimony oxyhalide can be formed during combustion, and can cover the surface of combustible materials to isolate external heat and oxygen to a certain extent, so that the oxygen index effect of the material can be improved. When a certain amount of cuprous bromide is compounded, cuprous bromide can react with sodium antimonate when the material is heated and decomposed, so that the forward reaction of the sodium antimonate is promoted, and the flame retardant efficiency of the material is further improved. The invention successfully solves the problem of low oxygen index performance of the modified nylon product, the oxygen index can reach 35.8, and the overall mechanical property and flame retardant performance of the material are improved. The flame-retardant cable can be applied to the field of mature low-voltage electrical appliances, can also be applied to the connector industry with higher requirements on flame retardance and mechanical properties, is particularly suitable for the field of rail transit, and can meet the EN45545HL3 grade of the rail transit industry.
The above description is only for the purpose of illustrating the preferred embodiments of the present invention and is not to be construed as limiting the invention, and any modifications, equivalents, improvements and the like that fall within the spirit and principle of the present invention are intended to be included therein.
Claims (10)
1. A high oxygen index polyamide composition, characterized by comprising the following components:
the main flame retardant is melamine cyanurate, and the auxiliary flame retardant is a composition of sodium antimonate and cuprous bromide; 0.5-8 parts by weight of sodium antimonate; 1.7-2 parts by weight of cuprous bromide.
2. The high oxygen index polyamide composition of claim 1, wherein the aliphatic polyamide resin is 54 to 80 parts by weight; the glass fiber accounts for 20-35 parts by weight; 6-15 parts by weight of melamine cyanurate; 5-8 parts of sodium antimonate; 1.8-2 parts of cuprous bromide.
3. The high oxygen index polyamide composition according to any one of claims 1 to 2, characterized in that the aliphatic polyamide resin has a melt relative viscosity of 2.0 to 2.8.
4. The high oxygen index polyamide composition according to any of claims 1-2, characterized in that the glass fibers are surface treated by polyurethane modification.
5. The polyamide composition with high oxygen index according to any of claims 1-2, characterized in that the melamine cyanurate has a particle size D50 < 5 μm.
6. The high oxygen index polyamide composition of any of claims 1-2, wherein the aliphatic polyamide resin is nylon 6 or nylon 66.
7. The high oxygen index polyamide composition according to any one of claims 1 to 2, characterized in that it further comprises other auxiliaries, said auxiliaries being in the range of 0.1 to 1 part by weight.
8. The high oxygen index polyamide composition of claim 7, wherein the auxiliary agent is either one or both of an antioxidant and a lubricant.
9. Process for the preparation of a polyamide composition with a high oxygen index according to any one of claims 1 to 8, characterized in that it comprises the following steps: weighing the components in parts by weight, and putting the components into a mixer for mixing until the components are uniform to obtain a premix; then putting the obtained premix into a double-screw extruder for melt mixing, and extruding and granulating to obtain the high-oxygen polyamide composition; wherein the length-diameter ratio of a screw of the double-screw extruder is 40-48: 1, the temperature of a screw cylinder is 200-275 ℃, and the rotating speed of the screw is 250-500 rpm.
10. Use of a high oxygen index polyamide composition according to any one of claims 1 to 8 for the preparation of low voltage electrical devices, connectors, rail transit appliances.
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Citations (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPH06192568A (en) * | 1992-12-22 | 1994-07-12 | Asahi Chem Ind Co Ltd | Flame retardant polyamide resin composition of high reliability |
| JP2000080270A (en) * | 1998-07-02 | 2000-03-21 | Mitsui Chemicals Inc | Semi-aromatic polyamide resin composition |
| CN103304986A (en) * | 2012-03-13 | 2013-09-18 | 合肥杰事杰新材料股份有限公司 | Mildewproof flame retardant polyamide and preparation method thereof |
-
2022
- 2022-01-21 CN CN202210074671.7A patent/CN114395249B/en active Active
Patent Citations (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPH06192568A (en) * | 1992-12-22 | 1994-07-12 | Asahi Chem Ind Co Ltd | Flame retardant polyamide resin composition of high reliability |
| JP2000080270A (en) * | 1998-07-02 | 2000-03-21 | Mitsui Chemicals Inc | Semi-aromatic polyamide resin composition |
| CN103304986A (en) * | 2012-03-13 | 2013-09-18 | 合肥杰事杰新材料股份有限公司 | Mildewproof flame retardant polyamide and preparation method thereof |
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