Flame retardant compositions, resin compositions and molded parts thereof

Abstract

This application discloses a flame retardant composition, a resin composition, and molded parts thereof, belonging to the field of flame retardant technology. This application combines a brominated flame retardant with dialkyl-substituted phosphines and monoalkyl-substituted phosphines, controlling their amounts within a specific range to synergistically exert their effects. The resulting flame retardant composition possesses both excellent flame retardant properties and resistance to photoaging, making it suitable for use in resin systems such as polybutylene terephthalate and polyamide. The resulting resin composition can be used to manufacture products in the fields of household appliances or electronic appliances.

Description

Technical Field

[0001] This application relates to the field of flame retardant technology, specifically to flame retardant compositions, resin compositions, and molded parts thereof. Background Technology

[0002] Polymer materials (i.e., resin materials) have been widely used in many fields due to their excellent comprehensive properties. However, their inherent flammability not only limits their application in high-safety-requirement scenarios, but also poses a serious safety hazard. Therefore, it is necessary to add flame retardants to meet safety requirements.

[0003] Currently, the bromine-antimony system is one of the most widely used flame retardant systems. However, the core components of this system (such as antimony compounds like antimony trioxide) are affected by factors such as intensified industry competition and tightened regional export control policies. Not only have their prices remained high for a long time, but they also face the problem of insufficient supply stability, making it difficult to meet the downstream industry's demand for cost control and supply chain security. Therefore, there is an urgent need to develop efficient alternatives to bromine-antimony system flame retardants.

[0004] At the same time, polymer materials are often affected by sunlight in various practical applications, which puts forward stringent requirements on their weather resistance. Summary of the Invention

[0005] Based on the deficiencies of the existing technology, the purpose of this application is to provide a flame retardant composition, a resin composition and a molded part thereof, wherein the flame retardant not only has excellent flame retardant properties, but also can improve the photoaging properties of the resin material.

[0006] To achieve the above objectives, in a first aspect, this application provides a flame retardant composition comprising the following components in parts by weight: 48-82 parts of dialkyl-substituted phosphonates Monoalkyl-substituted phosphonates, 20-50 parts, 140-500 parts of brominated flame retardant; The dialkyl-substituted phosphonate is at least one of the compounds of formula I, and the monoalkyl-substituted phosphonate is at least one of the compounds of formula II. , R 1 R 2 and R 3 Each group is independently selected from the following groups: C1~C8 straight-chain alkyl, C3~C8 branched alkyl, C3~C8 cycloalkyl, C7~C8 aralkyl, and aromatic groups; X and Y are each independently selected from Al, Mg, Ca, Zn, Ti, or Fe; n and m are each independently selected from integers between 2 and 4.

[0007] By controlling the amounts of the dialkyl-substituted phosphonate, the monoalkyl-substituted phosphonate, and the brominated flame retardant within the aforementioned specific range, the three components can work synergistically to achieve the resulting flame retardant composition, which possesses both excellent flame retardant properties and resistance to photoaging.

[0008] The dialkyl-substituted phosphonate is 48 to 82 parts by weight, such as 48 parts by weight, 50 parts by weight, 52 parts by weight, 54 parts by weight, 56 parts by weight, 58 parts by weight, 60 parts by weight, 62 parts by weight, 64 parts by weight, 66 parts by weight, 68 parts by weight, 70 parts by weight, 72 parts by weight, 74 parts by weight, 76 parts by weight, 78 parts by weight, 80 parts by weight, 82 parts by weight, or any two of the above ranges.

[0009] The monoalkyl-substituted phosphonate is 20 to 50 parts by weight, such as 20 parts by weight, 22 parts by weight, 24 parts by weight, 26 parts by weight, 28 parts by weight, 30 parts by weight, 32 parts by weight, 34 parts by weight, 36 parts by weight, 38 parts by weight, 40 parts by weight, 42 parts by weight, 44 parts by weight, 46 parts by weight, 48 parts by weight, 50 parts by weight, or any two of the above ranges.

[0010] The brominated flame retardant is present in an amount of 140-500 parts by weight, such as 140 parts by weight, 160 parts by weight, 180 parts by weight, 200 parts by weight, 220 parts by weight, 240 parts by weight, 260 parts by weight, 280 parts by weight, 300 parts by weight, 320 parts by weight, 340 parts by weight, 360 parts by weight, 380 parts by weight, 400 parts by weight, 420 parts by weight, 440 parts by weight, 460 parts by weight, 480 parts by weight, 500 parts by weight, or any two of these ranges. Preferably, the brominated flame retardant constitutes more than 55% of the flame retardant composition by weight, such as 55%, 58%, 60%, 62%, 64%, 66%, 68%, 70%, 72%, 74%, 76%, 78%, 80%, 82%, 84%, 88%, or any two of these ranges.

[0011] In Equations I and II, R 1 R 2 and R 3 They can be completely different, or two or three of them can be the same; X and Y can be the same or different; n and m can be the same or different.

[0012] For example, the C1 to C8 straight-chain alkyl group is at least one of C1, C2, C3, C4, C5, C6, C7 or C8 straight-chain alkyl groups.

[0013] For example, the C3-C8 branched alkyl group is at least one of C3, C4, C5, C6, C7, or C8 branched alkyl groups. In some embodiments, the C3-C8 branched alkyl group is at least one of (CH3)2CH-, (CH3)2CHCH2-, (CH3)3C-, (CH3)2CHCH2CH2-, CH3CH2CH(CH3)CH2-, (CH3)3CCH2-, (CH3)2CHCH2CH2CH2-, CH3CH(CH3)CH2CH2CH2-, (CH3)2CHCH2CH2CH2CH2-, CH3CH2CH2CH2CH(CH3)CH2-, (CH3CH2)2CHCH2CH2-, (CH3)2CHCH2C(CH3)2CH2-, CH3CH2CH(CH2CH3)CH2CH2CH2-, or CH3CH2CH2CH2CH2CH(CH3)CH2-.

[0014] For example, the C3 to C8 cycloalkyl group is at least one of C3, C4, C5, C6, C7 or C8 cycloalkyl groups.

[0015] For example, the C7-C8 aralkyl group is at least one of C7 and C8 aralkyl groups. In the C7-C8 aralkyl group, the alkyl portion can be straight-chain or branched; the aromatic portion can be phenyl.

[0016] For example, aromatic groups include, but are not limited to, phenyl groups.

[0017] For example, n is selected from 2, 3 or 4.

[0018] For example, m is selected from 2, 3 or 4.

[0019] Preferably, R 1 and R 2 Each group is independently selected from the following groups: C1~C8 straight-chain alkyl, C3~C8 branched alkyl or C7~C8 aralkyl, which not only have excellent stability but are also easy to synthesize.

[0020] The mass ratio of the dialkyl-substituted phosphinate to the monoalkyl-substituted phosphinate is 1:1 to 4:1, such as 1:1, 1.2:1, 1.4:1, 1.6:1, 1.8:1, 2:1, 2.2:1, 2.4:1, 2.6:1, 2.8:1, 3:1, 3.2:1, 3.4:1, 3.6:1, 3.8:1, 4:1, or any range formed by two or more of these ratios. Preferably, the mass ratio of the dialkyl-substituted phosphinate to the monoalkyl-substituted phosphinate is (1.5~2.3):1, to enhance the synergistic effect of the two and achieve a more balanced and superior flame retardancy and photoaging resistance of the composition.

[0021] Preferably, the mass ratio of the brominated flame retardant to the total mass of the dialkyl-substituted phosphinate and the monoalkyl-substituted phosphinate is (1.4~5):1, such as 1.4:1, 1.6:1, 1.8:1, 2:1, 2.2:1, 2.4:1, 2.6:1, 2.8:1, 3:1, 3.2:1, 3.4:1, 3.6:1, 3.8:1, 4:1, 4.2:1, 4.4:1, 4.6:1, 4.8:1, 5:1, or any two of the above ranges. More preferably, the mass ratio of the brominated flame retardant to the total mass of the dialkyl-substituted phosphinate and the monoalkyl-substituted phosphinate is (2~4):1.

[0022] When the mass ratio of the brominated flame retardant to the total mass of the dialkyl-substituted phosphonate and the monoalkyl-substituted phosphonate is in the range of (1.4~5):1, especially in the range of (2~4):1, the composition exhibits a more superior and balanced flame retardancy and resistance to photoaging.

[0023] Preferably, the dialkyl-substituted phosphinate includes aluminum diethylphosphinate, aluminum di-n-propylphosphinate, aluminum diisopropylphosphinate, aluminum di-n-butylphosphinate, aluminum diisobutylphosphinate, aluminum di-n-pentylphosphinate, aluminum diisopentylphosphinate, aluminum di-n-hexylphosphinate, aluminum di-n-heptylphosphinate, aluminum di-n-octylphosphinate, aluminum diphenylethylphosphinate, zinc diethylphosphinate, zinc di-n-propylphosphinate, zinc diisopropylphosphinate, zinc diisopropylphosphinate, zinc diisobutylphosphinate, and aluminum diisopropylphosphinate. Zinc butylphosphinate, zinc di-n-pentylphosphinate, zinc di-isopentylphosphinate, zinc di-n-hexylphosphinate, zinc di-n-heptylphosphinate, zinc di-n-octylphosphinate, zinc diphenylethylphosphinate, magnesium diethylphosphinate, magnesium di-n-propylphosphinate, magnesium di-isopropylphosphinate, magnesium di-n-butylphosphinate, magnesium di-isobutylphosphinate, magnesium di-n-pentylphosphinate, magnesium di-isopentylphosphinate, magnesium di-n-hexylphosphinate, magnesium di-n-heptylphosphinate, magnesium di-n-octylphosphinate, zinc diphenylethylphosphinate Magnesium diphosphinate, titanium diethylphosphinate, titanium di-n-propylphosphinate, titanium diisopropylphosphinate, titanium di-n-butylphosphinate, titanium diisobutylphosphinate, titanium di-n-pentylphosphinate, titanium diisopentylphosphinate, titanium di-n-hexylphosphinate, titanium di-n-heptylphosphinate, titanium di-n-octylphosphinate, titanium diphenylethylphosphinate, calcium diethylphosphinate, calcium di-n-propylphosphinate, calcium diisopropylphosphinate, calcium di-n-butylphosphinate, calcium diisobutylphosphinate, calcium di-n-pentylphosphinate At least one of the following: calcium phosphonate, diisopentyl calcium phosphonate, di-n-hexyl calcium phosphonate, di-n-heptyl calcium phosphonate, di-n-octyl calcium phosphonate, diphenylethyl calcium phosphonate, diethylferric phosphonate, di-n-propylferric phosphonate, diisopropylferric phosphonate, di-n-butylferric phosphonate, diisobutylferric phosphonate, di-n-pentylferric phosphonate, diisopentylferric phosphonate, di-n-heptylferric phosphonate, di-n-octylferric phosphonate, and diphenylethylferric phosphonate.

[0024] Preferably, the monoalkyl-substituted phosphinate includes aluminum ethylphosphinate, aluminum n-propylphosphinate, aluminum isopropylphosphinate, aluminum n-butylphosphinate, aluminum isobutylphosphinate, aluminum n-pentylphosphinate, aluminum isopentylphosphinate, aluminum n-hexylphosphinate, aluminum n-heptylphosphinate, aluminum n-octylphosphinate, aluminum cyclohexylphosphinate, aluminum phenylphosphinate, aluminum benzylphosphinate, aluminum phenylethylphosphinate, zinc ethylphosphinate, zinc n-propylphosphinate, zinc isopropylphosphinate, zinc n-butylphosphinate, zinc isobutylphosphinate, and zinc n-pentylphosphinate. Zinc phosphonate, zinc isopentyl phosphonate, zinc n-hexyl phosphonate, zinc n-heptyl phosphonate, zinc n-octyl phosphonate, zinc cyclohexyl phosphonate, zinc phenyl phosphonate, zinc benzyl phosphonate, zinc phenethyl phosphonate, magnesium ethyl phosphonate, magnesium n-propyl phosphonate, magnesium isopropyl phosphonate, magnesium n-butyl phosphonate, magnesium isobutyl phosphonate, magnesium n-pentyl phosphonate, magnesium isopentyl phosphonate, magnesium n-hexyl phosphonate, magnesium n-heptyl phosphonate, magnesium n-octyl phosphonate, magnesium cyclohexyl phosphonate, magnesium phenyl phosphonate, magnesium benzyl phosphonate, magnesium phenyl phosphonate, magnesium phenethyl phosphonate, magnesium phenyl ... Magnesium phosphinate, Titanium ethyl phosphinate, Titanium n-propyl phosphinate, Titanium isopropyl phosphinate, Titanium n-butyl phosphinate, Titanium isobutyl phosphinate, Titanium n-pentyl phosphinate, Titanium isopentyl phosphinate, Titanium n-hexyl phosphinate, Titanium n-heptyl phosphinate, Titanium n-octyl phosphinate, Titanium cyclohexyl phosphinate, Titanium phenyl phosphinate, Titanium benzyl phosphinate, Titanium phenylethyl phosphinate, Calcium ethyl phosphinate, Calcium n-propyl phosphinate, Calcium isopropyl phosphinate, Calcium n-butyl phosphinate, Calcium isobutyl phosphinate, Calcium n-pentyl phosphinate, Calcium isopentyl phosphinate At least one of the following: calcium hexylphosphonate, calcium heptylphosphonate, calcium octylphosphonate, calcium cyclohexylphosphonate, calcium phenylphosphonate, calcium benzylphosphonate, calcium phenylethylphosphonate, iron ethylphosphonate, iron propylphosphonate, iron isopropylphosphonate, iron butylphosphonate, iron isobutylphosphonate, iron pentylphosphonate, iron isopentylphosphonate, iron hexylphosphonate, iron heptylphosphonate, iron octylphosphonate, iron cyclohexylphosphonate, iron phenylphosphonate, iron benzylphosphonate, and iron phenylethylphosphonate.

[0025] In some embodiments, the di(or mono)alkyl-substituted phosphonates can be commercially available or prepared using conventional methods in the art, including but not limited to the methods described below. For example, a method for preparing di(or mono)alkyl-substituted phosphonates includes the following steps: Sodium di(or mono)alkyl-substituted hypophosphonates are mixed with water-soluble salts to undergo a metathesis reaction to obtain di(or mono)alkyl-substituted hypophosphonate products.

[0026] Among them, dialkyl-substituted sodium hypophosphite is at least one of the compounds of formula III. ; Among them, R 1 and R 2Each group is independently selected from the following groups: C1~C8 straight-chain alkyl, C3~C8 branched alkyl, C3~C8 cycloalkyl, C7~C8 aralkyl, and aromatic group.

[0027] In Formula III, R 1 and R 2 They can be the same, yet they can also be different.

[0028] In Equation III, when R 1 and / or R 2 When selected from C1-C8 straight-chain alkyl groups, the C1-C8 straight-chain alkyl groups can be at least one of C1, C2, C3, C4, C5, C6, C7 or C8 straight-chain alkyl groups.

[0029] In Equation III, when R 1 and / or R 2 When selected from C3-C8 branched alkyl groups, the C3-C8 branched alkyl groups can be at least one of C3, C4, C5, C6, C7 or C8 branched alkyl groups. In one embodiment, the C3-C8 branched alkyl group is at least one of (CH3)2CH-, (CH3)2CHCH2-, (CH3)3C-, (CH3)2CHCH2CH2-, CH3CH2CH(CH3)CH2-, (CH3)3CCH2-, (CH3)2CHCH2CH2CH2-, CH3CH(CH3)CH2CH2CH2-, (CH3)2CHCH2CH2CH2CH2-, CH3CH2CH2CH2CH(CH3)CH2-, (CH3CH2)2CHCH2CH2-, (CH3)2CHCH2C(CH3)2CH2-, CH3CH2CH(CH2CH3)CH2CH2CH2-, or CH3CH2CH2CH2CH2CH(CH3)CH2-.

[0030] In Equation III, when R 1 and / or R 2 When selected from C3-C8 cycloalkyl groups, the C3-C8 cycloalkyl group can be at least one of C3, C4, C5, C6, C7, or C8 cycloalkyl groups.

[0031] In Equation III, when R 1 and / or R 2 When selected from C7-C8 aralkyl groups, the C7-C8 aralkyl group can be at least one of C7 and C8 aralkyl groups. In a C7-C8 aralkyl group, the alkyl moiety can be straight-chain or branched; the aromatic moiety can be phenyl.

[0032] In Equation III, when R 1 and / or R 2 When selected from aromatic groups, the aromatic group can be phenyl.

[0033] In some embodiments, the dialkyl-substituted sodium hypophosphite used includes at least one of sodium diethylphosphite, sodium di-n-propylphosphite, sodium diisopropylphosphite, sodium di-n-butylphosphite, sodium diisobutylphosphite, sodium di-n-pentylphosphite, sodium di-n-hexylphosphite, sodium di-n-heptylphosphite, and sodium di-n-octylphosphite.

[0034] Sodium hypophosphite with a monoalkyl substituted group is at least one of the compounds of formula IV. ; R 3 Selected from the following groups: C1~C8 straight-chain alkyl, C3~C8 branched alkyl, C3~C8 cycloalkyl, C7~C8 aralkyl, aromatic group.

[0035] In Equation IV, when R 3 When selected from C1 to C8 straight-chain alkyl groups, the C1 to C8 straight-chain alkyl groups can be C1, C2, C3, C4, C5, C6, C7, or C8 straight-chain alkyl groups.

[0036] In Equation IV, when R 3 When selected from C3-C8 branched alkyl groups, the C3-C8 branched alkyl groups can be C3, C4, C5, C6, C7 or C8 branched alkyl groups. In one embodiment, the C3-C8 branched alkyl group is (CH3)2CH-, (CH3)2CHCH2-, (CH3)3C-, (CH3)2CHCH2CH2-, CH3CH2CH(CH3)CH2-, (CH3)3CCH2-, (CH3)2CHCH2CH2CH2-, CH3CH(CH3)CH2CH2CH2-, (CH3)2CHCH2CH2CH2CH2-, CH3CH2CH2CH2CH(CH3)CH2-, (CH3CH2)2CHCH2CH2-, (CH3)2CHCH2C(CH3)2CH2-, CH3CH2CH(CH2CH3)CH2CH2CH2-, or CH3CH2CH2CH2CH2CH(CH3)CH2-.

[0037] In Equation IV, when R 3 When selected from C3 to C8 cycloalkyl groups, the C3 to C8 cycloalkyl groups can be C3, C4, C5, C6, C7, or C8 cycloalkyl groups.

[0038] In Equation IV, when R 3 When selected from C7-C8 aralkyl groups, the C7-C8 aralkyl group can be at least one of C7 and C8 aralkyl groups. In a C7-C8 aralkyl group, the alkyl moiety can be straight-chain or branched; the aromatic moiety can be phenyl.

[0039] In Equation IV, when R 3 When selected from aromatic groups, the aromatic group can be phenyl.

[0040] In some embodiments, the monoalkyl-substituted sodium hypophosphite used includes at least one of sodium ethyl phosphite, sodium n-propyl phosphite, sodium isopropyl phosphite, sodium n-butyl phosphite, sodium isobutyl phosphite, and sodium phenyl phosphite.

[0041] The water-soluble salt is a water-soluble salt of at least one metal selected from Al, Mg, Ca, Zn, Ti, and Fe. In some embodiments, the water-soluble salt is at least one selected from water-soluble chloride, water-soluble nitrate, and water-soluble sulfate. For example, the water-soluble salt includes at least one selected from aluminum nitrate, aluminum sulfate, magnesium chloride, magnesium nitrate, magnesium sulfate, calcium chloride, calcium nitrate, zinc chloride, zinc nitrate, zinc sulfate, ferric chloride, ferric nitrate, and ferric sulfate.

[0042] In one embodiment, when sodium di(or mono)alkyl-substituted phosphonate undergoes a metathesis reaction with a water-soluble salt, the reaction temperature is controlled at 80-90°C.

[0043] In one embodiment, the molar ratio of di(or mono)alkyl-substituted sodium hypophosphite to the water-soluble salt is (0.5~8):1.

[0044] In one embodiment, before mixing the di(or mono)alkyl-substituted sodium hypophosphite with the water-soluble salt, the di(or mono)alkyl-substituted sodium hypophosphite is diluted with a solvent to a content of 20wt% to 40wt%, and the pH value is adjusted to between 2 and 3 with an acid. The solvent can be water, etc.; the acid used to adjust the pH value can be sulfuric acid, etc.

[0045] In one embodiment, when di(or mono)alkyl-substituted sodium hypophosphite is mixed with a water-soluble salt, the water-soluble salt is introduced in the form of a solution containing 20wt% to 25wt% of the water-soluble salt.

[0046] In one embodiment, the metathesis reaction is carried out under an inert atmosphere. The inert atmosphere may be nitrogen or / or argon.

[0047] In one embodiment, the preparation method of the di(or mono)hydrocarbon substituted phosphonate further includes the following steps: after metathesis reaction, crystallization, solid-liquid separation, washing, and drying.

[0048] Di(or mono) alkyl-substituted phosphonates can also be prepared by other methods, such as the free radical addition method described in the literature (Zhang Mengting. Synthesis Research of Novel Phosphorus Flame Retardants [D]. Southeast University, 2022).

[0049] In some embodiments, the bromine content in the flame retardant composition is 30% to 65% by mass, such as a range formed by any two of 30%, 35%, 40%, 45%, 50%, 55%, 60%, 65%, or more.

[0050] The mass percentage (%) of bromine in the flame retardant composition = the mass percentage (%) of the brominated flame retardant in the flame retardant composition × the mass content of bromine in the brominated flame retardant. For example, the mass content of bromine in commercially available ICL-IP FR-245 and F-3014 is 0.67% (67%) and 0.6% (60%), respectively. To achieve a bromine mass percentage of 40% in the flame retardant composition, the mass percentage of FR-245 in the flame retardant composition needs to be controlled at 59.7%, or the mass percentage of F-3014 in the flame retardant composition needs to be controlled at 66.7%.

[0051] In some embodiments, preferably, the bromine content of the bromine element in the bromine-based flame retardant is 50% to 83% by mass, such as 50%, 55%, 60%, 65%, 70%, 75%, 80%, or 83%.

[0052] The mass percentage of bromine in the brominated flame retardant was determined by high-temperature alkali fusion-potential titration, as follows: Accurately weigh 0.30 g of the brominated flame retardant sample powder, add 1.0 g of solid Na₂CO₃ and 3.5 g of solid NaOH, heat until the alkali becomes molten, and continue heating until the brominated flame retardant sample powder is fully absorbed by the alkali (i.e., the brominated flame retardant sample powder completely disappears). Cool, add water to dissolve the sample, pour into a 250 mL volumetric flask, dilute to volume, shake well, accurately pipette 5 mL of the sample solution into a titration cup, add 50 mL of water and 10 mL of nitric acid solution (68 wt%), stir to disperse, and titrate to the endpoint with silver nitrate standard titration solution. Calculate the mass percentage of bromine content based on the titration results.

[0053] Brominated flame retardants commonly used in the art can be selected, such as at least one of brominated triazine, brominated epoxy resin, decabromodiphenyl ethane, brominated polyimide, brominated polystyrene, polybrominated styrene, brominated polycarbonate, and pentabromobenzyl polyacrylate. The brominated epoxy resin can be end-capped or unend-capped. In some embodiments, the end-capping groups are derived from phenolic compounds, such as tribromophenol.

[0054] When the flame retardant composition is applied to polybutylene terephthalate and / or polyamide systems, the weight average molecular weight of the brominated flame retardant is preferably 0.5 million or more, for example, within any two of the ranges of 0.5 million, 10,000, 50,000, 100,000, 200,000, 300,000, 400,000, 500,000, 600,000 or more.

[0055] More preferably, the weight-average molecular weight of the brominated flame retardant is 0.5 million to 500,000.

[0056] The weight-average molecular weight of the brominated flame retardant was determined by gel permeation chromatography (GPC) according to GB / T 36214.1-2018 standard.

[0057] Preferably, the brominated flame retardant includes at least one of brominated epoxy resin, brominated polystyrene, polybrominated styrene, brominated polycarbonate, and pentabromobenzyl polyacrylate.

[0058] Preferably, the flame retardant composition further comprises the following components in parts by weight: 3 to 16 parts of an anti-dripping agent to improve anti-dripping performance. For example, the anti-dripping agent is in the range of 3 parts by weight, 4 parts by weight, 5 parts by weight, 6 parts by weight, 7 parts by weight, 8 parts by weight, 9 parts by weight, 10 parts by weight, 11 parts by weight, 12 parts by weight, 13 parts by weight, or any combination thereof.

[0059] In some embodiments, the anti-dripping agent includes at least one of polytetrafluoroethylene (PTFE), styrene-acrylonitrile random copolymer coated PTFE, styrene-methyl methacrylate copolymer coated PTFE, and silicone resin coated PTFE.

[0060] Depending on actual needs, at least one of melamine cyanurate, magnesium hydroxide, etc., may also be added to the flame retardant composition. For example, the amount of melamine cyanurate added is 0-10 parts by weight, such as 0, 2 parts by weight, 4 parts by weight, 6 parts by weight, 8 parts by weight, 10 parts by weight, or any range formed by any two of these. For example, the amount of magnesium hydroxide added is 0-10 parts by weight, such as 0, 2 parts by weight, 4 parts by weight, 6 parts by weight, 8 parts by weight, 10 parts by weight, or any range formed by any two of these.

[0061] The flame retardant composition is prepared as follows: the raw materials of each component are mixed and dispersed to obtain the flame retardant composition.

[0062] Secondly, this application provides a resin composition comprising the flame retardant composition.

[0063] Preferably, the resin composition comprises the following components in parts by weight: 100 parts of matrix resin, The flame retardant composition is 20-60 parts. 0-80 parts glass fiber; The matrix resin includes at least one of polybutylene terephthalate and polyamide.

[0064] By controlling the specific amounts of matrix resin, flame retardant composition and glass fiber contained in the resin composition, it possesses both excellent flame retardancy and resistance to photoaging, making it suitable for application in the fields of home appliances or electronic appliances. For example, the resin composition can be used to manufacture housings for home appliance control boxes, connectors, relays, power tools, and new energy vehicle charging guns.

[0065] For example, the flame retardant composition is within the range of any two of 20 parts by weight, 25 parts by weight, 30 parts by weight, 35 parts by weight, 40 parts by weight, 45 parts by weight, 50 parts by weight, 55 parts by weight, 60 parts by weight, or more.

[0066] For example, the glass fiber is in the range of 0, 5 parts by weight, 10 parts by weight, 15 parts by weight, 20 parts by weight, 25 parts by weight, 30 parts by weight, 35 parts by weight, 40 parts by weight, 45 parts by weight, 50 parts by weight, 55 parts by weight, 60 parts by weight, 65 parts by weight, 70 parts by weight, 75 parts by weight, 80 parts by weight, or any two of the above.

[0067] Preferably, the intrinsic viscosity of the polybutylene terephthalate at 25°C is 0.7~1.3 dL / g, such as 0.7 dL / g, 0.75 dL / g, 0.8 dL / g, 0.85 dL / g, 0.9 dL / g, 0.95 dL / g, 1 dL / g, 1.05 dL / g, 1.1 dL / g, 1.15 dL / g, 1.2 dL / g, 1.25 dL / g, 1.3 dL / g, or any two of the above ranges.

[0068] The intrinsic viscosity of the polybutylene terephthalate is tested as follows: according to ISO 1628-5:2015 standard, it is measured at 25°C using a mixed solvent of phenol / 1,1,2,2-tetrachloroethane (60 / 40, w / w).

[0069] Preferably, the polyamide has a relative viscosity of 2.0 to 3.4 at 25°C, such as 2.0, 2.2, 2.4, 2.6, 2.8, 3.0, 3.2, 3.4 or any two of the above ranges.

[0070] The relative viscosity of the polyamide is tested as follows: based on the basic principles of ISO 307:2007, the polyamide is dissolved in 96wt% sulfuric acid at 25°C to prepare a 1% concentration (i.e., 1 g / 100 mL) solution, and then the viscosity is measured.

[0071] Preferably, the polyamide includes at least one of PA6, PA66, PA56, PA610, and PA1010.

[0072] Preferably, the glass fiber comprises alkali-free glass fiber treated with a coupling agent.

[0073] More preferably, the average diameter of the glass fiber is 8~15μm, such as 8μm, 9μm, 10μm, 11μm, 12μm, 13μm, 14μm, 15μm or any two of the above ranges.

[0074] The average diameter of the glass fibers was measured using a scanning electron microscope (SEM).

[0075] Preferably, the bromine content in the resin composition is 4.2% to 15% by mass, such as any two ranges of 4.2%, 5%, 5.5%, 6%, 6.5%, 7%, 7.5%, 8%, 8.5%, 9%, 9.5%, 10%, 10.5%, 11%, 11.5%, 12%, 12.5%, 13%, 13.5%, 14%, 14.5%, 15% or more.

[0076] Other additives may also be added to the resin composition to improve its thermal stability, processability, weather resistance, and / or color. In some embodiments, the other additives include at least one of antioxidants, lubricants, weather-resistant agents, colorants, etc.

[0077] The antioxidant can be selected with reference to existing technologies, such as at least one of hindered phenolic antioxidants, phosphite antioxidants, divalent sulfur antioxidants, hindered amine antioxidants, benzofuranone antioxidants, etc.

[0078] Specifically, the hindered phenolic antioxidants include, but are not limited to, pentaerythritol tetrakis[β-(3,5-di-tert-butyl-4-hydroxyphenyl)propionate] (antioxidant 1010), octadecyl β-(3,5-di-tert-butyl-4-hydroxyphenyl)propionate (antioxidant 1076), N,N'-bis-(3-(3,5-di-tert-butyl-4-hydroxyphenyl)propionyl)hexamethylenediamine (antioxidant 1098), 1,3,5-trimethyl-2,4,6-tris(3,5-di-tert-butyl-4-hydroxybenzyl)benzene (antioxidant 1330), 1,3,5-tris(3,5-di-tert-butyl-4-hydroxybenzyl)isocyanuric acid (antioxidant 3114), 1,2-bis[β-(3,5-di-tert-butyl-4-hydroxyphenyl)propionyl]hydrazine (antioxidant 1024), and triethylene glycol. Ether-di(3-tert-butyl-4-hydroxy-5-methylphenyl)propionate (antioxidant 245), 1,3,5-tris(4-tert-butyl-3-hydroxy-2,6-dimethylbenzyl)-1,3,5-triazine-2,4,6-(1H,3H,5H)-trione (antioxidant 1790), 1,1,3-tris(2-methyl-4-hydroxy-5-tert-butylphenyl)butane (antioxidant CA), 2-tert-butyl-6-(3-tert-butyl-5-methyl-2-hydroxyphenyl)-4-methylphenyl acrylate, 2-(2-hydroxy-3-tert-butyl-5-methylbenzyl)-4-methyl-6-tert-butylphenyl acrylate (antioxidant GM), 2,6-di-tert-butyl-4-methylphenol (antioxidant 264), styrene-modified phenol (anti-aging agent SP), 2, At least one of 2'-methylenebis(4-methyl-6-tert-butylphenol) (antioxidant 2246); The phosphite antioxidants include, but are not limited to, at least one of the following: tris[2,4-di-tert-butylphenyl]phosphite (antioxidant 168), 3,9-bis(2,4-dicumylphenoxy)-2,4,8,10-tetraoxa-3,9-diphosphaspiro[5.5]undecane (antioxidant 9228), tris(nonylphenyl)phosphite (antioxidant TNP), bis(4-octylphenol) diphosphate (antioxidant 1093); The divalent sulfur antioxidants include, but are not limited to, at least one of dilaurate thiodipropionate (DLTP), distearate thiodipropionate (DSTP), and pentaerythritol tetra(3-lauryl thiopropionate) (antioxidant 412S); The hindered amine antioxidants include, but are not limited to, at least one of the following: bis(1,2,2,6,6-pentamethyl-4-piperidinyl) sebacate (LS-744), sebacate bis-2,2,6,6-tetramethylpiperidinol ester (LS-770), tris(1,2,2,6,6-pentamethylpiperidinol) phosphite (GW-540), and 4,4'-adipamide diaminobis(2,2,6,6-tetramethylpiperidin-1-oxy) (FlamstabNOR116); The benzofuranone antioxidants include, but are not limited to, at least one of 5,7-bis(1,1-dimethylethyl)-3-[2,3-dimethylphenyl]-2(3H)-benzofuranone (antioxidant 136) and 4-tert-butyl-2-(5-tert-butyl-2-oxo-3H-1-benzofuran-3-yl)phenyl 3,5-di-tert-butyl-4-hydroxybenzoate (antioxidant 501).

[0079] In one embodiment, the antioxidant includes hindered phenolic antioxidants and phosphite antioxidants, wherein the mass ratio of the hindered phenolic antioxidants to the phosphite antioxidants is (0.25~1):1.

[0080] The lubricant can be selected with reference to existing technologies. For example, the lubricant includes, but is not limited to, at least one of amide lubricants, stearate lubricants, ester lubricants, silicone lubricants, etc.

[0081] Specifically, the amide lubricants include, but are not limited to, at least one of erucamide, methyl bis-stearamide, or N,N-ethylene bis-stearamide; The stearate lubricants include, but are not limited to, at least one of calcium stearate, magnesium stearate, zinc stearate, or barium stearate; The ester lubricants include, but are not limited to, at least one of ethylene glycol stearate, glyceryl stearate, or pentaerythritol stearate; The silicone lubricant includes, but is not limited to, at least one of PE-based silicone masterbatch (e.g., silicone content 40 wt%~80 wt%), PP-based silicone masterbatch (e.g., silicone content 40 wt%~80 wt%), and SAN-based silicone masterbatch (e.g., silicone content 40 wt%~80 wt%).

[0082] The weathering agent can be selected with reference to existing technologies. For example, the weathering agent includes, but is not limited to, at least one of benzophenone-based UV absorbers, benzotriazole-based UV absorbers, etc.

[0083] The colorant can be selected with reference to existing technologies. Exemplarily, the colorant includes, but is not limited to, at least one of pigment-type colorants, dye-type colorants, etc. Examples of pigments include titanium dioxide, phthalocyanine, ultramarine, iron oxide, or carbon black, and one or more of all organic pigments. Examples of dyes include one or more of azo yellow, quinacridone, perylene red, dioxazine, indolineone, isoindoline, anthraquinone blue, and anthraquinone violet.

[0084] In some embodiments, the other adjuvants are 0 to 2 parts by weight, such as 0.1 parts by weight, 0.3 parts by weight, 0.5 parts by weight, 0.7 parts by weight, 1 part by weight, 1.2 parts by weight, 1.4 parts by weight, 1.6 parts by weight, 1.8 parts by weight, 2 parts by weight, or any range formed by two or more of these.

[0085] In some embodiments, the matrix resin is present in the resin composition at a weight percentage of 45%-83.3%, such as the range formed by any two of 45%, 50%, 55%, 60%, 65%, 70%, 75%, 80%, 83.3% or more.

[0086] In some embodiments, the method for preparing the resin composition includes the following steps: melting and extruding the component raw materials, granulating them, and obtaining the resin composition.

[0087] In one embodiment, the step of melting the component raw materials is as follows: the raw materials, except for glass fiber, are mixed and dispersed and then added from the main feed port of the extruder, and glass fiber (if present) is added from the side feed port of the extruder for melt extrusion.

[0088] Preferably, in preparing the resin composition, melt extrusion and granulation are carried out in a twin-screw extruder.

[0089] In one embodiment, the melt extrusion satisfies the following conditions: the melt extrusion temperature is 220~250℃, the screw speed is 250~400rpm, and the screw length-to-diameter ratio is 36:1~48:1.

[0090] In one embodiment, the feeding rate (i.e., the sum of the feeding rates of all component raw materials) is 350~800 kg / h.

[0091] Thirdly, this application provides a molded part formed from the resin composition. The molding method can be selected with reference to existing technologies, such as, but not limited to, injection molding, extrusion molding, blow molding, rotational molding, and / or compression molding.

[0092] Compared with the prior art, the beneficial effects of this application are as follows: This application combines brominated flame retardants with specific dialkyl-substituted phosphines and monoalkyl-substituted phosphines, and controls their dosage within a specific range to synergistically exert the effects of the three, so that the resulting flame retardant composition can have both excellent flame retardant properties and anti-photoaging properties, and is suitable for use in resin systems such as polybutylene terephthalate and polyamide, and the resulting resin composition can be used to prepare products in the fields of household appliances or electronic appliances. Detailed Implementation

[0093] To better illustrate the purpose, technical solutions, and advantages of this application, the following description, in conjunction with specific embodiments and comparative examples, aims to provide a detailed understanding of the content of this application, rather than limiting it. All other embodiments obtained by those skilled in the art without inventive effort are within the protection scope of this application. Unless otherwise specified, the experimental reagents and instruments involved in the implementation of this application are commonly used reagents and instruments. In this application, the technical features described in an open-ended manner include both closed-ended technical solutions composed of the listed features and open-ended technical solutions that include the listed features.

[0094] The raw materials used in the following embodiments and comparative examples are shown below. Unless otherwise specified, all raw materials are commercially available. In addition, the same raw materials were used in each parallel experiment: Dialkyl-substituted phosphonates 1: Aluminum diethylphosphonate, prepared as follows: Sodium diethylphosphonate is diluted with water to a concentration of 35 wt%, the pH is adjusted to 2.5 with sulfuric acid, and aluminum sulfate solution (aluminum sulfate content is 25 wt%) is added to carry out the reaction. The reaction is carried out under a nitrogen atmosphere and the reaction temperature is controlled at 85℃. After the reaction is completed, crystallize, filter, wash, and dry to obtain aluminum diethylphosphonate.

[0095] Dialkyl-substituted phosphinate 2: di-n-octylphosphinate aluminum, was prepared according to the process described in Sections 3.2.2 to 3.2.3 of the literature (Zhang Mengting. Synthesis Study of Novel Phosphorus Flame Retardants [D]. Southeast University, 2022).

[0096] Dialkyl-substituted phosphonate 3: aluminum diisopropylphosphonate, whose preparation method differs from that of dialkyl-substituted phosphonate 1 in that sodium diisopropylphosphonate is used instead of sodium diethylphosphonate.

[0097] Dihydro-substituted phosphonate 4: Zinc diethylphosphonate, the preparation method of which differs from that of dihydro-substituted phosphonate 1, is that zinc chloride solution (zinc chloride content of 22wt%) is used to completely replace aluminum sulfate solution.

[0098] Monoalkyl-substituted phosphonate 1: Aluminum ethylphosphonate, whose preparation method differs from that of dialkyl-substituted phosphonate 1 in that sodium ethylphosphonate is used instead of sodium diethylphosphonate.

[0099] Monoalkyl-substituted phosphonate 2: aluminum n-butylphosphonate, whose preparation method differs from that of monoalkyl-substituted phosphonate 1 in that sodium n-butylphosphonate is used instead of sodium ethylphosphonate.

[0100] Monoalkyl-substituted phosphinate 3: Aluminum phenylphosphinate, Hubei Chuyuebang New Material Technology Co., Ltd.

[0101] Monoalkyl-substituted phosphonate 4: Zinc ethylphosphonate, the preparation method of which differs from that of monoalkyl-substituted phosphonate 1, is that zinc chloride solution (zinc chloride content of 22wt%) is used to completely replace aluminum sulfate solution.

[0102] Bromine-based flame retardant 1: Brominated epoxy resin, Jiangsu Xingsheng Chemical Co., Ltd., EP-15K.

[0103] Brominated flame retardant 2: Brominated polystyrene, Lanxess Chemical, Germany, BPS 301.

[0104] Brominated flame retardant 3: polybrominated styrene, Albemarle (ALB), PBS-64HW.

[0105] Brominated flame retardant 4: Brominated polycarbonate, Teijin Limited, FG-8500.

[0106] Brominated flame retardant 5: Pentabromobenzyl polyacrylate, ICL, FR-1025.

[0107] Polybutylene terephthalate 1: intrinsic viscosity at 25°C is 0.7 dL / g, Sinopec Yizheng Chemical Fiber Co., Ltd., GX111.

[0108] Polybutylene terephthalate 2: intrinsic viscosity at 25°C is 1.3 dL / g, Sinopec Yizheng Chemical Fiber Co., Ltd., GL236.

[0109] Polyamide 1: Relative viscosity of 2.5 at 25℃, Jiangsu Haiyang Huaxian Co., Ltd., HY2500A.

[0110] Polyamide 2: Relative viscosity of 3.4 at 25℃, Jiangsu Haiyang Huaxian Co., Ltd., HY3400A.

[0111] Glass fiber: Alkali-free glass fiber treated with aminosilane coupling agent, with an average diameter of 10μm, Taishan Glass Fiber Co., Ltd., ECS10-4.5-T436H.

[0112] Melamine cyanurate (MCA): Manufacturer: Jinan Jinyingtai Chemical Co., Ltd.

[0113] Melamine polyphosphate (MPP): Manufacturer: Jinan Jinyingtai Chemical Co., Ltd.

[0114] Al(H2PO2)3: Fujian Xin'an Technology Co., Ltd., FR605.

[0115] The following examples and comparative examples all provide a resin composition, and their preparation methods include the following steps: According to the formulations of the flame retardant compositions in Tables 1 and 2, weigh out each component raw material, mix and disperse them to obtain the flame retardant composition; According to the formulation of the resin composition in Tables 3 and 4, weigh the raw materials of each component, mix and disperse the raw materials of the components except for glass fiber (if any), and add them from the main feed port of the twin-screw extruder. Add the glass fiber (if any) from the side feed port of the twin-screw extruder, perform melt extrusion, granulation, and obtain the resin composition. The temperature of the twin screws from the feed port to the die head in the twin-screw extruder is 220℃, 230℃, 230℃, 240℃, 250℃, 240℃, 240℃, 230℃, and 220℃, respectively. The screw speed is 350 rpm, the screw length-to-diameter ratio is 40:1, and the feeding speed is 500 kg / h.

[0116] Table 1 Table 2 Table 3 Table 4 The resin compositions of the above examples and comparative examples were subjected to the following performance tests: (1) Flame retardant performance: The resin composition was injection molded into a standard sample with a thickness of 1.5 mm, and the vertical burning flame retardant performance of the sample was tested according to UL94-2023 standard; (2) Light aging resistance test: Aging was carried out using a xenon lamp aging method according to ISO4892-2-2013, 0.51W / cm 2 @340nm, aging duration 500 hours, X-Rite 7000A colorimeter was used to test the Lab values ​​before and after aging and calculate the color difference ΔE (ΔE=(Δa²+Δb²+ΔL²)). ½ Meanwhile, according to the standard ISO 178-2019, the bending deflection γ before aging and the bending deflection γ' after aging are tested, and the bending deflection retention rate is calculated: Bending deflection retention rate = γ' / γ×100.

[0117] The test results are shown in Table 5, where “NG” indicates that the V-2 level was not achieved.

[0118] Table 5 As can be seen from the above data, the resin compositions of each embodiment of this application have both excellent flame retardancy and resistance to light aging. For example, the flame retardancy (thickness 1.5mm) reaches V-0 level, the color difference change ΔE after 500h of light aging is less than 15, and the bending deflection retention rate after 500h of light aging is more than 80%.

[0119] Comparative Examples 1 and 2, lacking either dialkyl-substituted or monoalkyl-substituted phosphonates, resulted in a significant deterioration in the flame retardancy and light aging resistance of the resin compositions. This indicates that dialkyl-substituted and monoalkyl-substituted phosphonates synergistically improve the flame retardancy and light aging resistance of the resin compositions.

[0120] Comparative Examples 3 and 4 showed a significant deterioration in the flame retardancy of the resin compositions due to the absence of hydrocarbon-substituted phosphines or brominated flame retardants, indicating that hydrocarbon-substituted phosphines and brominated flame retardants synergistically improve the flame retardancy of the resin compositions; moreover, the absence of hydrocarbon-substituted phosphines also leads to a significant deterioration in light aging resistance.

[0121] Comparative Examples 5-7 showed a significant deterioration in the flame retardancy or light aging resistance of the resin compositions due to the use of other flame retardants to replace the monohydrophosphinate groups.

[0122] Finally, it should be noted that the above embodiments are only used to illustrate the technical solutions of this application and are not intended to limit the scope of protection of this application. Although this application has been described in detail with reference to preferred embodiments, those skilled in the art should understand that modifications or equivalent substitutions can be made to the technical solutions of this application without departing from the substance and scope of the technical solutions of this application.

Claims

1. A flame retardant composition, characterized in that, Includes the following components in parts by weight: 48-82 parts of dialkyl-substituted phosphonates Monoalkyl-substituted phosphonates, 20-50 parts, 140-500 parts of brominated flame retardant; The dialkyl-substituted phosphonate is at least one of the compounds of formula I, and the monoalkyl-substituted phosphonate is at least one of the compounds of formula II. ， R 1 R 2 and R 3 Each group is independently selected from the following groups: C1~C8 straight-chain alkyl, C3~C8 branched alkyl, C3~C8 cycloalkyl, C7~C8 aralkyl, and aromatic groups; X and Y are each independently selected from Al, Mg, Ca, Zn, Ti, or Fe; n and m are each independently selected from integers between 2 and 4.

2. The flame retardant composition according to claim 1, characterized in that, The dialkyl-substituted phosphines include aluminum diethylphosphines, aluminum di-n-propylphosphines, aluminum diisopropylphosphines, aluminum di-n-butylphosphines, aluminum diisobutylphosphines, aluminum di-n-pentylphosphines, aluminum diisopentylphosphines, aluminum di-n-hexylphosphines, aluminum di-n-heptylphosphines, aluminum di-n-octylphosphines, aluminum diphenylethylphosphines, zinc diethylphosphines, zinc di-n-propylphosphines, zinc diisopropylphosphines, zinc di-n-butylphosphines, and zinc diisobutylphosphines. Zinc phosphonate, di-n-pentyl zinc phosphonate, di-isopentyl zinc phosphonate, di-n-hexyl zinc phosphonate, di-n-heptyl zinc phosphonate, di-n-octyl zinc phosphonate, diphenylethyl zinc phosphonate, diethyl magnesium phosphonate, di-n-propyl magnesium phosphonate, di-isopropyl magnesium phosphonate, di-n-butyl magnesium phosphonate, di-isobutyl magnesium phosphonate, di-n-pentyl magnesium phosphonate, di-isopentyl magnesium phosphonate, di-n-hexyl magnesium phosphonate, di-n-heptyl magnesium phosphonate, di-n-octyl magnesium phosphonate, diphenylethyl zinc phosphonate Magnesium phosphonate, diethylphosphonate titanium, di-n-propylphosphonate titanium, diisopropylphosphonate titanium, di-n-butylphosphonate titanium, diisobutylphosphonate titanium, di-n-pentylphosphonate titanium, diisopentylphosphonate titanium, di-n-hexylphosphonate titanium, di-n-heptylphosphonate titanium, di-n-octylphosphonate titanium, diphenylethylphosphonate titanium, calcium diethylphosphonate, calcium di-n-propylphosphonate, calcium diisopropylphosphonate, calcium di-n-butylphosphonate, calcium diisobutylphosphonate, di-n-pentylphosphonate The first of the following: calcium phosphite, diisopentyl calcium phosphite, di-n-hexyl calcium phosphite, di-n-heptyl calcium phosphite, di-n-octyl calcium phosphite, diphenylethyl calcium phosphite, diethylferric phosphite, di-n-propylferric phosphite, diisopropylferric phosphite, di-n-butylferric phosphite, diisobutylferric phosphite, di-n-pentylferric phosphite, diisopentylferric phosphite, di-n-hexylferric phosphite, di-n-heptylferric phosphite, and diphenylethylferric phosphite.

3. The flame retardant composition according to claim 1, characterized in that, The monoalkyl-substituted phosphinates include aluminum ethylphosphinate, aluminum n-propylphosphinate, aluminum isopropylphosphinate, aluminum n-butylphosphinate, aluminum isobutylphosphinate, aluminum n-pentylphosphinate, aluminum isopentylphosphinate, aluminum n-hexylphosphinate, aluminum n-heptylphosphinate, aluminum n-octylphosphinate, aluminum cyclohexylphosphinate, aluminum phenylphosphinate, aluminum benzylphosphinate, aluminum phenethylphosphinate, zinc ethylphosphinate, zinc n-propylphosphinate, zinc isopropylphosphinate, zinc n-butylphosphinate, zinc isobutylphosphinate, and zinc n-pentylphosphinate. Zinc isopentyl phosphinate, zinc n-hexyl phosphinate, zinc n-heptyl phosphinate, zinc n-octyl phosphinate, zinc cyclohexyl phosphinate, zinc phenyl phosphinate, zinc benzyl phosphinate, zinc phenethyl phosphinate, magnesium ethyl phosphinate, magnesium n-propyl phosphinate, magnesium isopropyl phosphinate, magnesium n-butyl phosphinate, magnesium isobutyl phosphinate, magnesium n-pentyl phosphinate, magnesium isopentyl phosphinate, magnesium n-hexyl phosphinate, magnesium n-heptyl phosphinate, magnesium n-octyl phosphinate, magnesium cyclohexyl phosphinate, magnesium phenyl phosphinate, magnesium benzyl phosphinate, magnesium phenethyl phosphinate Magnesium phosphonate, ethyl phosphonate titanium, n-propyl phosphonate titanium, isopropyl phosphonate titanium, n-butyl phosphonate titanium, isobutyl phosphonate titanium, n-pentyl phosphonate titanium, isopentyl phosphonate titanium, n-hexyl phosphonate titanium, n-heptyl phosphonate titanium, n-octyl phosphonate titanium, cyclohexyl phosphonate titanium, phenyl phosphonate titanium, benzyl phosphonate titanium, phenylethyl phosphonate titanium, ethyl phosphonate calcium, n-propyl phosphonate calcium, isopropyl phosphonate calcium, n-butyl phosphonate calcium, isobutyl phosphonate calcium, n-pentyl phosphonate calcium, isopentyl phosphonate calcium At least one of the following: calcium hexylphosphonate, calcium heptylphosphonate, calcium octylphosphonate, calcium cyclohexylphosphonate, calcium phenylphosphonate, calcium benzylphosphonate, calcium phenylethylphosphonate, iron ethylphosphonate, iron propylphosphonate, iron isopropylphosphonate, iron butylphosphonate, iron isobutylphosphonate, iron pentylphosphonate, iron isopentylphosphonate, iron hexylphosphonate, iron heptylphosphonate, iron octylphosphonate, iron cyclohexylphosphonate, iron phenylphosphonate, iron benzylphosphonate, and iron phenylethylphosphonate.

4. The flame retardant composition according to claim 1, characterized in that, The flame retardant composition contains 30% to 65% bromine by mass.

5. The flame retardant composition according to claim 1, characterized in that, The weight-average molecular weight of the brominated flame retardant is above 0.5 million; preferably, the weight-average molecular weight of the brominated flame retardant is between 0.5 million and 500,000.

6. The flame retardant composition according to claim 1, characterized in that, The brominated flame retardant includes at least one of brominated epoxy resin, brominated polystyrene, polybrominated styrene, brominated polycarbonate, and pentabromobenzyl polyacrylate.

7. A resin composition, characterized in that, Includes the flame retardant composition as described in any one of claims 1 to 6.

8. The resin composition according to claim 7, characterized in that, Includes the following components in parts by weight: 100 parts of matrix resin, The flame retardant composition is 20-60 parts. 0-80 parts glass fiber; The matrix resin includes at least one of polybutylene terephthalate and polyamide.

9. The resin composition according to claim 8, characterized in that, At least one of the following conditions must be met: (1) The intrinsic viscosity of the polybutylene terephthalate at 25°C is 0.7~1.3 dL / g; (2) The relative viscosity of the polyamide at 25°C is 2.0~3.4; (3) The glass fiber includes alkali-free glass fiber treated with coupling agent, and the average diameter of the glass fiber is 8~15μm.

10. A molded part, characterized in that, It is formed from the resin composition as described in any one of claims 7 to 9.

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