Polyester composition and application thereof

Abstract

The invention provides a polyester composition and application thereof. The polyester composition comprises the following components in parts by mass: 40-99.5 parts of polyester resin and 5-35 parts of a flame retardant, the flame retardant is prepared from the following components in parts by mass: 30 to 90 parts of diethyl phosphinate, 0.01 to 3 parts of ethyl phosphonate, 5 to 67 parts of dialkyl phosphinate and 0.01 to 5.5 parts of alkyl phosphinate. According to the flame-retardant polyester composition, the specific flame retardant is introduced, so that the flame-retardant polyester composition plays an excellent and efficient flame-retardant effect, and the polyester composition has excellent flame-retardant property, high deflection, good toughness and bending property and excellent performance in the aspect of mechanical properties.

Description

Technical Field

[0001] The invention belongs to the technical field of polymer materials, and particularly relates to a polyester composition and application thereof. Background Art

[0002] Polybutylene terephthalate (PBT) is a crystalline thermoplastic resin with a melting point of 225-235°C and a heat deformation temperature exceeding 180°C. It can be used for long periods below 140°C and exhibits excellent mechanical and electrical properties, as well as heat and chemical resistance. Polyethylene terephthalate (PET) is also crystalline and exhibits excellent weather resistance, creep resistance, fatigue resistance, and wear resistance. It is also the toughest thermoplastic.

[0003] Both PBT and PET possess excellent mechanical and processing properties, making them highly sought-after polyester materials for widespread use in automotive, connector, and electrical appliance housings. Since polyesters like PBT and PET are primarily used in products requiring fire safety, such as electrical appliances, automobiles, and household appliances, flame retardant modification is particularly important. For example, CN102952381A discloses a glass fiber reinforced PBT / PET alloy material, comprising the following components: 22.5%-41% PBT, 22.5%-41% PET, 6%-20% compound flame retardant, 3%-15% antimony trioxide, 20%-30% glass fiber, 2%-10% toughening agent, 0.1%-1% antioxidant, and 0.1%-1% oxide; wherein the compound flame retardant is composed of brominated polystyrene, magnesium hypophosphite and talc, which together with antimony trioxide form a flame retardant system, giving the material good flame retardancy; however, the flame retardant efficiency of brominated polystyrene is relatively low, and the compound flame retardant and antimony trioxide need to be added in larger amounts to achieve the ideal flame retardant effect, and a high amount of flame retardant added will seriously affect the mechanical properties of the material. In addition, although brominated polystyrene is an environmentally friendly flame retardant, it still contains halogens and cannot meet the requirements for use in halogen-free products with high environmental standards.

[0004] Dialkyl phosphinates are general-purpose halogen-free flame retardants with excellent flame retardant properties, low smoke production during combustion, and minimal impact on the physical and electrical properties of the base polymer. This allows materials containing them to meet the application requirements of industries such as electrical appliances and energy storage. However, dialkyl phosphinates have low flame retardant efficiency when used alone and usually need to be used in combination with other flame retardants. For example, CN112724618A discloses a halogen-free flame-retardant reinforced PBT material, the components of which are as follows: 45%-55% PBT, 0.1%-0.5% coupling agent, 2%-5% composite toughening agent, 15%-25% composite flame retardant, 0.3%-1.5% antioxidant, and 0.1%-0.6% lubricant; the composite flame retardant is composed of a halogen-free flame retardant and a synergistic flame retardant. The halogen-free flame retardant is aluminum diethylphosphinate and melamine polyphosphate, and the synergistic flame retardant is zinc borate. The combination of the three achieves excellent flame retardant properties.

[0005] Although dialkylphosphinates combined with melamine phosphate, melamine cyanurate, and other compounds can improve flame retardancy, they can only achieve the desired flame retardant effect when added to the polymer system at a high level. Excessive addition of flame retardants can lead to a decrease in mechanical properties of the polyester material, such as toughness and flexibility. Therefore, developing a polyester material with excellent flame retardancy and mechanical properties, such as flexibility, is an urgent problem to be solved in this field. Summary of the Invention

[0006] In view of the deficiencies of the prior art, the object of the present invention is to provide a polyester composition and its application, wherein the flame retardant can exert a high-efficiency flame retardant effect, so that the polyester composition containing it has excellent flame retardant properties while having high flexibility, good toughness and bending properties, and excellent mechanical properties.

[0007] To achieve this object, the present invention adopts the following technical solutions:

[0008] In a first aspect, the present invention provides a polyester composition comprising the following components in parts by mass:

[0009] 40-99.5 parts of polyester resin

[0010] 5-35 parts of flame retardant.

[0011] Based on 100 parts by weight of the flame retardant, the flame retardant comprises the following components:

[0012]

[0013] The dialkyl phosphinate has a structure as shown in Formula I, and the alkyl phosphinate has a structure as shown in Formula II:

[0014]

[0015] Wherein, R1, R2, and R3 are each independently selected from any one of a substituted or unsubstituted C2-C8 straight chain or branched alkyl group, a substituted or unsubstituted C3-C8 cycloalkyl group, and a substituted or unsubstituted C6-C18 aryl group.

[0016] The total number of carbon atoms in R1 and R2 is ≥6.

[0017] The substituents in R1, R2 and R3 are each independently selected from at least one of a C1-C8 straight or branched chain alkyl group and a C6-C18 aryl group.

[0018] M1 and M2 are each independently a cationic moiety; specifically, M1 m+ Indicates +m ion, M2 n+ Indicates an ion with a +n valence.

[0019] m and n are each independently selected from integers of 2-4, for example, 2, 3 or 4.

[0020] The present invention utilizes four specific phosphonates, formulated in specific dosages, to synergistically enhance flame retardancy, imparting the flame retardant with superior and highly effective flame retardancy. This flame retardant, when used to flame-retard polyester, imparts to the polyester composition excellent flame retardancy, high flexibility, good toughness, and bending properties, resulting in superior mechanical properties.

[0021] The following are preferred technical solutions of the present invention, but are not intended to limit the technical solutions provided by the present invention. Through the following preferred technical solutions, the objectives and beneficial effects of the present invention can be better achieved and realized.

[0022] In the polyester composition of the present invention, the mass parts of the polyester resin are 40-99.5 parts, for example, it can be 45 parts, 50 parts, 55 parts, 60 parts, 65 parts, 70 parts, 75 parts, 80 parts, 85 parts, 90 parts, 95 parts or 98 parts, as well as specific point values ​​between the above point values. Due to space limitations and for the sake of simplicity, the present invention no longer exhaustively lists the specific point values ​​included in the said range.

[0023] The mass parts of the flame retardant are 5-35 parts, for example, 6 parts, 8 parts, 10 parts, 12 parts, 15 parts, 18 parts, 20 parts, 22 parts, 25 parts, 28 parts, 30 parts, 32 parts or 34 parts, as well as specific point values ​​between the above point values. Due to space limitations and for the sake of simplicity, the present invention no longer exhaustively lists the specific point values ​​included in the range.

[0024] Based on the total mass of the flame retardant as 100 parts, the mass of diethyl phosphinate is 30-90 parts, for example, it can be 35 parts, 40 parts, 45 parts, 50 parts, 55 parts, 60 parts, 65 parts, 70 parts, 75 parts, 80 parts or 85 parts, as well as specific point values ​​between the above point values. Due to space limitations and for the sake of simplicity, the present invention no longer exhaustively lists the specific point values ​​included in the range.

[0025] Based on the total mass of the flame retardant as 100 parts, the mass of ethyl phosphonate is 0.01-3 parts, for example, it can be 0.05 parts, 0.1 parts, 0.2 parts, 0.5 parts, 0.8 parts, 1 parts, 1.2 parts, 1.5 parts, 1.8 parts, 2 parts, 2.2 parts, 2.5 parts or 2.8 parts, as well as specific point values ​​between the above point values. Due to space limitations and for the sake of simplicity, the present invention no longer exhaustively lists the specific point values ​​included in the range.

[0026] Based on the total mass of the flame retardant as 100 parts, the mass of the dialkyl phosphinate is 5-67 parts, for example, 8 parts, 10 parts, 15 parts, 20 parts, 25 parts, 30 parts, 35 parts, 40 parts, 45 parts, 50 parts, 55 parts, 60 parts or 65 parts, as well as specific point values ​​between the above points. Due to space limitations and for the sake of simplicity, the present invention no longer exhaustively lists the specific point values ​​included in the range.

[0027] Based on the total mass of the flame retardant as 100 parts, the mass of the hydrocarbyl phosphinate is 0.01-5.5 parts, for example, it can be 0.05 parts, 0.1 parts, 0.2 parts, 0.5 parts, 0.8 parts, 1 parts, 1.2 parts, 1.5 parts, 1.8 parts, 2 parts, 2.2 parts, 2.5 parts, 2.8 parts, 3 parts, 3.2 parts, 3.5 parts, 3.8 parts, 4 parts, 4.2 parts, 4.5 parts, 4.8 parts, 5 parts, 5.2 parts or 5.4 parts, as well as specific point values ​​between the above point values. Due to space limitations and for the sake of simplicity, the present invention no longer exhaustively lists the specific point values ​​included in the range.

[0028] In the present invention, the polyester resin comprises a condensation product of a dicarboxylic acid and / or its derivatives with a diol. The dicarboxylic acid comprises any one or a combination of at least two of an aliphatic dicarboxylic acid, an alicyclic dicarboxylic acid, or an aromatic dicarboxylic acid, preferably an aromatic dicarboxylic acid. The diol comprises an aliphatic diol and / or an alicyclic diol.

[0029] Preferably, the dicarboxylic acid includes any one of terephthalic acid, isophthalic acid, phthalic acid, naphthalene dicarboxylic acid, succinic acid, adipic acid, suberic acid, azelaic acid, sebacic acid, dodecanedioic acid, cyclohexanedicarboxylic acid, hydrogenated isophthalic acid, and hydrogenated phthalic acid, or a combination of at least two thereof, and more preferably any one of terephthalic acid, isophthalic acid, phthalic acid, and naphthalene dicarboxylic acid, or a combination of at least two thereof.

[0030] The dicarboxylic acid derivatives include acid halides (eg, acid chlorides), esters, acid anhydrides, and the like formed from dicarboxylic acids.

[0031] Preferably, the diol includes any one of ethylene glycol, propylene glycol, butylene glycol, hexylene glycol, and 1,4-cyclohexanedimethanol, or a combination of at least two thereof.

[0032] Preferably, the polyester resin includes any one or a combination of at least two of polyethylene terephthalate (PET), polypropylene terephthalate (PTT), polybutylene terephthalate (PBT), poly-1,4-cyclohexanedimethanol terephthalate (PCT), polyethylene 2,6-naphthalate (PEN), and polybutylene 2,6-naphthalate (PBN), and is more preferably polyethylene terephthalate and / or polybutylene terephthalate.

[0033] Preferably, the intrinsic viscosity of the polyester resin is 0.5-1.2 dL / g, for example, it can be 0.6 dL / g, 0.7 dL / g, 0.8 dL / g, 0.9 dL / g, 1 dL / g, 1.1 dL / g or 1.2 dL / g, as well as specific point values ​​between the above point values. Due to space limitations and for the sake of simplicity, the present invention no longer exhaustively lists the specific point values ​​included in the range.

[0034] For example, the intrinsic viscosity of the polyester resin can be measured at 25° C. using the method in standard ISO 1628-5:2015.

[0035] Preferably, the diethylphosphinate has a structure as shown in Formula III, and the ethylphosphonate has a structure as shown in Formula IV:

[0036]

[0037] In formula III, M3 a+ represents an ion with a valence of +a, where a is selected from an integer of 2-4, for example, 2, 3 or 4. M3 is the cationic portion of diethylphosphinate, which can be a metal or a non-metal (for example, an amine cation, a cation corresponding to melamine and its derivatives), preferably a metal; M3 is further preferably any one of Al, Ca, Mg, Cu, Zn, Fe, and Ti, more preferably Al.

[0038] In Formula IV, M4 b+ represents an ion with a valence of +b, where b is selected from an integer of 2 to 4, for example, 2, 3, or 4. M4 is the cationic portion of the ethylphosphonate, which may be a metal or a non-metal (for example, an amine cation, a cation corresponding to melamine and its derivatives), preferably a metal; M4 is further preferably any one of Al, Ca, Mg, Cu, Zn, Fe, and Ti, more preferably Al.

[0039] In the present invention, the dialkyl phosphinate has a structure as shown in Formula I, and the alkyl phosphinate has a structure as shown in Formula II.

[0040] In the present invention, the C2-C8 straight chain or branched alkyl group can be a straight chain or branched alkyl group of C2, C3, C4, C5, C6, C7, or C8, illustratively including but not limited to: ethyl, n-propyl, isopropyl, n-butyl, isobutyl, sec-butyl, tert-butyl, 2-methylbutyl, n-pentyl, isopentyl, neopentyl, 2-methylpentyl, 2-ethylpentyl, n-hexyl, neohexyl, 2-methylhexyl, 2-ethylhexyl, heptyl, octyl, etc.

[0041] In the present invention, the C3-C8 cycloalkyl groups can be C3, C4, C5, C6, C7, C8 cycloalkyl groups, including monocyclic alkyl groups, bridged cyclic groups, polycyclic alkyl groups, etc., illustratively including but not limited to: cyclopropyl, cyclobutyl, cyclopentyl, cyclohexyl, cycloheptyl, cyclooctyl, etc.

[0042] In the present invention, the C6-C18 aromatic groups can be aromatic groups such as C6, C9, C10, C11, C12, C13, C14, C15, C16, C17, and C18, including monocyclic aromatic groups and condensed-ring aromatic groups, illustratively including but not limited to phenyl, biphenyl, terphenyl, naphthyl, anthracenyl, phenanthrenyl, indenyl, and fluorenyl.

[0043] In the present invention, the C1-C8 straight chain or branched alkyl group can be a straight chain or branched alkyl group of C1, C2, C3, C4, C5, C6, C7, or C8, illustratively including but not limited to: methyl, ethyl, n-propyl, isopropyl, n-butyl, isobutyl, sec-butyl, tert-butyl, 2-methylbutyl, n-pentyl, isopentyl, neopentyl, 2-methylpentyl, 2-ethylpentyl, n-hexyl, neohexyl, 2-methylhexyl, 2-ethylhexyl, heptyl, octyl, etc.

[0044] In the present invention, the term "substituted or unsubstituted" may be substituted with one or more substituents. When there are multiple (at least two) substituents, they may be the same or different. The same expressions used below have the same meaning. Unless otherwise specified, the substituents may be selected from at least one of a C1-C8 linear or branched alkyl group and a C6-C18 aryl group, and are not further described.

[0045] Preferably, R1 and R2 are each independently selected from any one of a substituted or unsubstituted C2-C8 straight chain or branched alkyl group, a substituted or unsubstituted C3-C6 cycloalkyl group, and a substituted or unsubstituted phenyl group.

[0046] Preferably, the substituents in R1 and R2 are each independently selected from at least one of a C1-C6 straight-chain or branched alkyl group and a phenyl group.

[0047] Preferably, R1 and R2 are each independently selected from any one of ethyl, n-propyl, isopropyl, n-butyl, isobutyl, sec-butyl, phenethyl, phenylpropyl, phenylbutyl, pentyl, 2-methylpentyl, 2-ethylpentyl, hexyl, 2-methylhexyl, 2-ethylhexyl, cyclohexyl, methylcyclohexyl, dimethylcyclohexyl, ethylcyclohexyl, heptyl, octyl, phenyl, methylphenyl, and dimethylphenyl.

[0048] In Formula I, the total number of carbon atoms in R1 and R2 is ≥6, for example, it can be 7, 8, 9, 10, 11, 12, 13, 14, 15, 16, 17, 18, 19, 20, etc. Preferably, the total number of carbon atoms in R1 and R2 is 6-14, more preferably 8-12.

[0049] Preferably, the dialkyl phosphinate comprises a combination of a dialkyl phosphinate A having a structure shown in formula IA and an ethylbutyl phosphinate having a structure shown in formula IB;

[0050]

[0051] wherein M1 and m have the same definitions as in formula I.

[0052] In Formula IA, R1' and R2' are each independently selected from any one of a substituted or unsubstituted C2-C8 (e.g., C3, C4, C5, C6, C7, etc.) linear or branched alkyl group, a substituted or unsubstituted C3-C8 (e.g., C4, C5, C6, C7, etc.) cycloalkyl group, and a substituted or unsubstituted C6-C18 (e.g., C6, C9, C10, C12, C14, C15, C16, C17, C18, etc.) aryl group.

[0053] In Formula IA, the total number of carbon atoms in R1' and R2' is ≥6, and when one of R1' and R2' is ethyl, the other is not butyl.

[0054] The substituents in R1' and R2' are each independently selected from at least one of C1-C8 (e.g., C2, C3, C4, C5, C6, C7, etc.) straight chain or branched alkyl, C6-C18 (e.g., C6, C9, C10, C12, C14, C15, C16, C17, C18, etc.) aromatic groups.

[0055] Preferably, in Formula IA, R1' and R2' are each independently selected from any one of a substituted or unsubstituted C2-C8 straight chain or branched alkyl group, a substituted or unsubstituted C3-C6 cycloalkyl group, and a substituted or unsubstituted phenyl group.

[0056] Preferably, the substituents in R1' and R2' are each independently selected from at least one of a C1-C6 straight-chain or branched alkyl group and a phenyl group.

[0057] More preferably, R1' and R2' are each independently selected from any one of ethyl, n-propyl, isopropyl, n-butyl, isobutyl, sec-butyl, phenethyl, phenylpropyl, phenylbutyl, pentyl, 2-methylpentyl, 2-ethylpentyl, hexyl, 2-methylhexyl, 2-ethylhexyl, cyclohexyl, methylcyclohexyl, dimethylcyclohexyl, ethylcyclohexyl, heptyl, octyl, phenyl, methylphenyl, and dimethylphenyl, and further preferably any one of n-propyl, isopropyl, n-butyl, isobutyl, sec-butyl, hexyl, cyclohexyl, methylcyclohexyl, and phenyl.

[0058] Preferably, in Formula IA, the total number of carbon atoms in R1' and R2' is ≥6, for example, it can be 7, 8, 9, 10, 11, 12, 13, 14, 15, 16, 17, 18, 19, 20, etc. More preferably, the total number of carbon atoms in R1' and R2' is 6-14, more preferably 8-12.

[0059] Preferably, the dialkyl phosphinate A comprises ethylpentylphosphinate, ethylhexylphosphinate, hexyloctylphosphinate, ethylcyclohexylphosphinate, ethylphenylphosphinate, ethylphenylethylphosphinate, ethylheptylphosphinate, dipropylphosphinate, propylbutylphosphinate, propylpentylphosphinate, propylhexylphosphinate, hexyloctylphosphinate, propylcyclohexylphosphinate, propylphenylphosphinate, propylphenylpropylphosphinate, propylheptylphosphinate, dibutylphosphinate, butylpentylphosphinate, butylhexylphosphinate, hexyloctylphosphinate, butylcyclohexylphosphinate, butylphenylphosphinate The salt is preferably any one of butylbenzenebutylphosphinate, butylheptylphosphinate, dicyclohexylphosphinate, dihexylphosphinate, and diphenylphosphinate, or a combination of at least two thereof; further preferably di-n-propylphosphinate, n-propylisopropylphosphinate, diisopropylphosphinate, di-n-butylphosphinate, diisobutylphosphinate, n-butylisobutylphosphinate, di-sec-butylphosphinate, n-butylsec-butylphosphinate, isobutylsec-butylphosphinate, n-butylcyclohexylphosphinate, isobutylcyclohexylphosphinate, dicyclohexylphosphinate, di-n-hexylphosphinate, and a combination of at least two thereof.

[0060] Preferably, based on the total mass of the flame retardant as 100 parts, the flame retardant includes 5-60 parts of dialkyl phosphinate A, and the mass of the dialkyl phosphinate A can be 8 parts, 10 parts, 15 parts, 20 parts, 25 parts, 30 parts, 35 parts, 40 parts, 45 parts, 50 parts, 55 parts or 58 parts, as well as specific point values ​​between the above point values. Due to space limitations and for the sake of simplicity, the present invention no longer exhaustively lists the specific point values ​​included in the range.

[0061] Preferably, based on the total mass of the flame retardant as 100 parts, the flame retardant includes 0.05-7 parts of ethyl butyl phosphinate, and the mass of the ethyl butyl phosphinate can be 0.08 parts, 0.1 parts, 0.2 parts, 0.5 parts, 0.8 parts, 1 parts, 1.5 parts, 2 parts, 2.5 parts, 3 parts, 3.5 parts, 4 parts, 4.5 parts, 5 parts, 5.5 parts, 6 parts or 6.5 parts, as well as specific point values ​​between the above point values. Due to space limitations and for the sake of simplicity, the present invention no longer exhaustively lists the specific point values ​​included in the range.

[0062] Preferably, in formula II, R3 is selected from any one of C2-C6 straight or branched alkyl, C3-C6 cycloalkyl, and phenyl, preferably any one of n-butyl, isobutyl, hexyl, cyclohexyl, and phenyl.

[0063] Preferably, the hydrocarbyl phosphinate includes any one of n-butyl phosphinate, isobutyl phosphinate, n-hexyl phosphinate, cyclohexyl phosphinate, and phenyl phosphinate, or a combination of at least two thereof.

[0064] In the present invention, M1 represents the cationic portion of the dialkyl phosphinate of the structure shown in Formula I, the dialkyl phosphinate A of the structure shown in Formula IA, and the ethylbutyl phosphinate of the structure shown in Formula IB, which can be a metal or a non-metal (such as an amine cation, a cation corresponding to melamine and its derivatives), preferably a metal.

[0065] Preferably, the M1 is selected from any one of Al, Ca, Mg, Cu, Zn, Fe, and Ti, more preferably Al.

[0066] In the present invention, M2 represents the cationic portion of the hydrocarbyl phosphinate of the structure shown in Formula II, which can be a metal or a non-metal (such as an amine cation, a cation corresponding to melamine and its derivatives), preferably a metal.

[0067] Preferably, M2 is selected from any one of Al, Ca, Mg, Cu, Zn, Fe, and Ti, and Al is further preferred.

[0068] In the present invention, the diethylphosphinate includes any one of a metal diethylphosphinate and a non-metal diethylphosphinate, or a combination of at least two thereof. For example, the non-metal cation in the non-metal diethylphosphinate may be an amine cation, such as a cation corresponding to melamine and its derivatives. Preferably, the diethylphosphinate is a metal diethylphosphinate.

[0069] Preferably, the diethylphosphinate includes any one or a combination of at least two of diethylphosphinate aluminum, diethylphosphinate calcium, diethylphosphinate magnesium, diethylphosphinate copper, diethylphosphinate zinc, diethylphosphinate iron, and diethylphosphinate titanium, and further preferably diethylphosphinate aluminum.

[0070] In the present invention, the ethylphosphonate includes any one of a metal ethylphosphonate and a non-metal ethylphosphonate, or a combination of at least two thereof. For example, the non-metal cation in the non-metal ethylphosphonate may be an amine cation, such as a cation corresponding to melamine and its derivatives. Preferably, the ethylphosphonate is a metal ethylphosphonate.

[0071] Preferably, the ethylphosphonate includes any one or a combination of at least two of aluminum ethylphosphonate, calcium ethylphosphonate, magnesium ethylphosphonate, copper ethylphosphonate, zinc ethylphosphonate, iron ethylphosphonate, and titanium ethylphosphonate, and aluminum ethylphosphonate is further preferred.

[0072] Preferably, based on 100 parts by total mass of the flame retardant, the flame retardant further comprises 0.01-25 parts of phosphite, and the mass of the phosphite can be 0.05 parts, 0.1 parts, 0.5 parts, 1 parts, 3 parts, 5 parts, 8 parts, 10 parts, 12 parts, 15 parts, 18 parts, 20 parts, 22 parts or 24 parts, as well as specific point values ​​between the above point values. Due to space limitations and for the sake of simplicity, the present invention no longer exhaustively lists the specific point values ​​included in the range.

[0073] In the present invention, the phosphite can be expressed as (M5 c+ )2(HPO3)c,M5 c+ represents an ion with a valence of +c, where c is selected from an integer of 2-4, for example, 2, 3, or 4. M5 is the cationic portion of the phosphite, which can be a metal or a non-metal (for example, an amine cation, a cation corresponding to melamine and its derivatives), preferably a metal; M5 is further preferably any one of Al, Ca, Mg, Cu, Zn, Fe, and Ti, more preferably Al.

[0074] The phosphite includes any one of a metal phosphite and a non-metal phosphite, or a combination of at least two thereof. For example, the non-metal cation in the non-metal phosphite may be an amine cation, such as a cation corresponding to melamine and its derivatives. Preferably, the phosphite is a metal phosphite.

[0075] Preferably, the phosphite includes any one of aluminum phosphite, calcium phosphite, magnesium phosphite, copper phosphite, zinc phosphite, iron phosphite, and titanium phosphite, or a combination of at least two of them.

[0076] As a preferred technical solution of the present invention, based on 100 parts by weight of the total mass of the flame retardant, the flame retardant includes the following components:

[0077]

[0078] In the present invention, the preparation method of the flame retardant comprises: mixing diethyl phosphinate, ethyl phosphonate, dialkyl phosphinate, alkyl phosphinate, and optionally phosphite to obtain the flame retardant.

[0079] In the present invention, the diethyl phosphinate, ethyl phosphonate, dialkyl phosphinate, alkyl phosphinate, and phosphite can be purchased from the market or prepared by synthetic methods known in the art.

[0080] It is understood that the flame retardant of the present invention (total mass is 100%) includes the following components in terms of mass percentage:

[0081]

[0082] Preferably, the flame retardant (total mass is 100%) comprises the following components in terms of mass percentage:

[0083]

[0084] Accordingly, the mass parts of diethyl phosphinate in the polyester composition can be understood as (5-35 parts)×(30%-90%), that is, the polyester composition includes 1.5-31.5 parts of diethyl phosphinate in parts by mass, and the mass parts of diethyl phosphinate can be 2 parts, 4 parts, 5 parts, 8 parts, 10 parts, 12 parts, 14 parts, 15 parts, 16 parts, 18 parts, 20 parts, 22 parts, 25 parts, 28 parts or 30 parts, etc.

[0085] Similarly, the polyester composition includes 0.0005-1.05 parts of ethyl phosphonate by mass, and the mass parts of the ethyl phosphonate can be 0.001 parts, 0.005 parts, 0.008 parts, 0.01 parts, 0.02 parts, 0.05 parts, 0.08 parts, 0.1 parts, 0.2 parts, 0.3 parts, 0.4 parts, 0.5 parts, 0.6 parts, 0.7 parts, 0.8 parts, 0.9 parts or 1 parts, etc.

[0086] The polyester composition includes 0.25-23.45 parts of dialkyl phosphinate in parts by mass, and the mass parts of the dialkyl phosphinate can be 0.3 parts, 0.5 parts, 0.8 parts, 1 parts, 2 parts, 4 parts, 5 parts, 6 parts, 8 parts, 10 parts, 12 parts, 14 parts, 15 parts, 16 parts, 18 parts, 20 parts, 22 parts or 23 parts, etc.

[0087] Preferably, the polyester composition comprises 0.0025-2.45 parts of ethyl butyl phosphinate in parts by mass, and the mass parts of the ethyl butyl phosphinate can be 0.003 parts, 0.005 parts, 0.01 parts, 0.02 parts, 0.04 parts, 0.05 parts, 0.06 parts, 0.08 parts, 0.1 parts, 0.2 parts, 0.3 parts, 0.4 parts, 0.5 parts, 0.6 parts, 0.7 parts, 0.8 parts, 0.9 parts, 1 parts, 1.2 parts, 1.4 parts, 1.5 parts, 1.6 parts, 1.8 parts, 2 parts, 2.2 parts or 2.4 parts, etc.

[0088] Preferably, the polyester composition comprises 0.25-21 parts of dialkyl phosphinate A by mass, and the mass parts of the dialkyl phosphinate A can be 0.3 parts, 0.5 parts, 0.8 parts, 1 parts, 2 parts, 4 parts, 5 parts, 6 parts, 8 parts, 10 parts, 12 parts, 14 parts, 15 parts, 16 parts, 18 parts or 20 parts, etc.

[0089] The polyester composition includes 0.0005-1.925 parts of hydrocarbyl phosphinate in parts by mass, and the mass parts of the hydrocarbyl phosphinate can be 0.001 parts, 0.005 parts, 0.008 parts, 0.01 parts, 0.02 parts, 0.05 parts, 0.08 parts, 0.1 parts, 0.2 parts, 0.3 parts, 0.4 parts, 0.5 parts, 0.6 parts, 0.7 parts, 0.8 parts, 0.9 parts, 1 parts, 1.2 parts, 1.4 parts, 1.5 parts, 1.6 parts, 1.8 parts or 1.9 parts, etc.

[0090] The polyester composition includes 0-8.75 parts of phosphite in parts by mass, and the mass parts of the phosphite can be 0.0005 parts, 0.001 parts, 0.01 parts, 0.05 parts, 0.1 parts, 0.5 parts, 1 parts, 1.5 parts, 2 parts, 2.5 parts, 3 parts, 3.5 parts, 4 parts, 4.5 parts, 5 parts, 5.5 parts, 6 parts, 6.5 parts, 7 parts, 7.5 parts, 8 parts or 8.5 parts, etc.

[0091] It should be noted that the polyester composition of the present invention may further include any fillers, other additives, other auxiliary agents, etc. that are added as desired in the art.

[0092] Preferably, the polyester composition further comprises 10-45 parts by mass of a reinforcing material, and the mass of the reinforcing material may be 12 parts, 15 parts, 18 parts, 20 parts, 22 parts, 25 parts, 28 parts, 30 parts, 32 parts, 35 parts, 38 parts, 40 parts, 42 parts or 44 parts, as well as specific values ​​between the above points. Due to space limitations and for the sake of simplicity, the present invention no longer exhaustively lists the specific points included in the range.

[0093] Preferably, the reinforcing material comprises glass fiber and / or carbon fiber, more preferably glass fiber.

[0094] Preferably, the glass fiber includes any one or a combination of at least two of alkali-free glass fiber (E glass fiber), medium-alkali glass fiber (C glass fiber), high-alkali glass fiber (A glass fiber), special glass fiber (S glass fiber), low dielectric glass fiber (D glass fiber), and quartz glass fiber.

[0095] Preferably, the diameter of the glass fiber is 0.1-50 μm, for example, it can be 0.5 μm, 1 μm, 2 μm, 5 μm, 8 μm, 10 μm, 12 μm, 15 μm, 18 μm, 20 μm, 22 μm, 25 μm, 28 μm, 30 μm, 35 μm, 40 μm or 45 μm, as well as specific point values ​​between the above point values. Due to space limitations and for the sake of simplicity, the present invention no longer exhaustively lists the specific point values ​​included in the range, and 5-20 μm is further preferred.

[0096] Preferably, the polyester composition further comprises an antioxidant and / or a lubricant.

[0097] Preferably, the polyester composition further comprises 0.01-1 parts by mass of an antioxidant, and the amount of the antioxidant may be 0.05 parts, 0.1 parts, 0.2 parts, 0.3 parts, 0.4 parts, 0.5 parts, 0.6 parts, 0.7 parts, 0.8 parts or 0.9 parts by mass, as well as specific values ​​between the above points. Due to space limitations and for the sake of simplicity, the present invention no longer exhaustively lists the specific points included in the range.

[0098] Preferably, the antioxidant includes any one of hindered amine antioxidants, hindered phenol antioxidants, phosphite antioxidants, and thioester antioxidants, or a combination of at least two of them.

[0099] Preferably, the polyester composition further comprises 0.01-1 parts by mass of a lubricant, and the mass portion of the lubricant may be 0.05 parts, 0.1 parts, 0.2 parts, 0.3 parts, 0.4 parts, 0.5 parts, 0.6 parts, 0.7 parts, 0.8 parts or 0.9 parts, as well as specific values ​​between the above points. Due to space limitations and for the sake of simplicity, the present invention no longer exhaustively enumerates the specific points included in the range.

[0100] Preferably, the lubricant includes any one of ester lubricants, alcohol lubricants, hydrocarbon lubricants, fatty acid lubricants, fatty acid amide lubricants, and metal soap lubricants, or a combination of at least two thereof.

[0101] Preferably, the polyester composition further comprises any one or a combination of at least two of a filler, a synergistic flame retardant, a colorant, an ultraviolet absorber, and a toughening agent.

[0102] Preferably, the filler includes any one or a combination of at least two of silicon dioxide, talc, titanium dioxide, barium sulfate, kaolin, calcium sulfate, boehmite, mica, magnesium carbonate, and glass microspheres.

[0103] Preferably, the mass fraction of filler in the polyester composition is ≤40 parts, for example, it can be 0, 0.1 parts, 0.5 parts, 1 parts, 2 parts, 5 parts, 8 parts, 10 parts, 15 parts, 20 parts, 25 parts, 30 parts, 35 parts or 38 parts, as well as specific values ​​between the above points. Due to space limitations and for the sake of simplicity, the present invention no longer exhaustively lists the specific points included in the range.

[0104] Preferably, the synergistic flame retardant includes any one of melamine polyphosphate, melamine polyphosphate, and borate, or a combination of at least two thereof.

[0105] Illustratively, the melamine polyphosphate includes melamine magnesium polyphosphate and / or melamine zinc polyphosphate; and the borate includes zinc borate.

[0106] Preferably, the mass fraction of the synergistic flame retardant in the polyester composition is ≤15 parts, for example, it can be 0, 0.1 parts, 0.5 parts, 1 parts, 2 parts, 4 parts, 5 parts, 6 parts, 8 parts, 10 parts, 12 parts or 14 parts, as well as specific point values ​​between the above point values. Due to space limitations and for the sake of simplicity, the present invention no longer exhaustively lists the specific point values ​​included in the range.

[0107] Preferably, the mass fractions of the colorant and the ultraviolet absorber in the polyester composition are each independently 0-2 parts, for example, 0.01 parts, 0.05 parts, 0.1 parts, 0.2 parts, 0.3 parts, 0.4 parts, 0.5 parts, 0.6 parts, 0.7 parts, 0.8 parts, 0.9 parts, 1 parts, 1.2 parts, 1.5 parts or 1.8 parts, as well as specific values ​​between the above points. Due to space limitations and for the sake of simplicity, the present invention no longer exhaustively lists the specific points included in the range.

[0108] Preferably, the colorant includes an inorganic colorant and / or an organic colorant; the colorant may include a pigment and / or a dye according to its solubility and coloring properties.

[0109] Illustratively, the colorant includes any one or a combination of at least two of titanium dioxide, ultramarine blue, iron oxide, zinc sulfide, carbon black, phthalocyanine, quinacridone, perylene black, and aniline black.

[0110] Preferably, the ultraviolet absorber includes any one or a combination of at least two of hydroxybenzoate ultraviolet absorbers, benzophenone ultraviolet absorbers, benzotriazole ultraviolet absorbers, substituted acrylonitrile ultraviolet absorbers, triazine ultraviolet absorbers, and hindered amine ultraviolet absorbers.

[0111] Preferably, the mass fraction of the toughening agent in the polyester composition is 0-10 parts, for example, it can be 0, 0.1 parts, 0.5 parts, 1 parts, 2 parts, 3 parts, 4 parts, 5 parts, 6 parts, 7 parts, 8 parts or 9 parts, as well as specific point values ​​between the above point values. Due to space limitations and for the sake of simplicity, the present invention no longer exhaustively lists the specific point values ​​included in the range.

[0112] In a preferred technical solution, the polyester composition comprises the following components in parts by mass:

[0113]

[0114] The polyester resin is a matrix material. Preferably, the mass percentage of the polyester resin in the polyester composition is 40%-99.5%, for example, it can be 45%, 50%, 55%, 60%, 65%, 70%, 75%, 80%, 85%, 90%, 95%, 98%, and specific values ​​between the above points. Due to space limitations and for the sake of simplicity, the present invention no longer exhaustively lists the specific points included in the range.

[0115] The flame retardant exerts a high-efficiency flame retardant effect. Preferably, the mass percentage of the flame retardant in the polyester composition is 5%-35%, for example, it can be 6%, 8%, 10%, 12%, 15%, 18%, 20%, 22%, 25%, 28%, 30%, 32% or 34%, as well as specific point values ​​between the above point values. Due to space limitations and for the sake of simplicity, the present invention no longer exhaustively lists the specific point values ​​included in the range, and 6%-25% is further preferred.

[0116] The reinforcing material can regulate the mechanical properties of the polyester composition and achieve a reinforcing effect. Preferably, the mass percentage of the reinforcing material in the polyester composition is 10%-45%, for example, it can be 12%, 15%, 18%, 20%, 22%, 25%, 28%, 30%, 32%, 35%, 38%, 40%, 42% or 44%, as well as specific point values ​​between the above point values. Due to space limitations and for the sake of simplicity, the present invention no longer exhaustively lists the specific point values ​​included in the said range.

[0117] Illustratively, the method for preparing the polyester composition comprises: melt-blending a polyester resin, a flame retardant, and optionally a reinforcing material, and then extruding the mixture to obtain the polyester composition.

[0118] Preferably, the melt blending further includes a premixing step, and the premixing includes: uniformly mixing the polyester with other additives to obtain a premix; the other additives include any one or a combination of at least two of lubricants, antioxidants, fillers, synergistic flame retardants, colorants, and ultraviolet absorbers.

[0119] Preferably, the melt blending is carried out in a screw extruder.

[0120] Preferably, the screw extruder is a twin-screw extruder.

[0121] Preferably, the temperature of the screw extruder is 80-300°C, for example, it can be 90°C, 100°C, 120°C, 150°C, 160°C, 170°C, 180°C, 190°C, 200°C, 210°C, 220°C, 230°C, 240°C, 250°C, 260°C, 270°C, 280°C or 290°C, as well as specific point values ​​between the above point values. Due to space limitations and for the sake of simplicity, the present invention no longer exhaustively lists the specific point values ​​included in the range.

[0122] Preferably, the extrusion further includes granulation and drying steps.

[0123] In a second aspect, the present invention provides a use of the polyester composition as described in the first aspect in automotive parts, energy storage devices, connectors or electronic appliances.

[0124] Compared with the prior art, the present invention has the following beneficial effects:

[0125] The polyester composition provided by the present invention has an excellent and efficient flame retardant effect by introducing a specific flame retardant, so that the polyester composition has excellent flame retardant properties, high flexibility, good toughness and bending properties, and excellent performance in mechanical properties. DETAILED DESCRIPTION

[0126] The technical solution of the present invention is further described below by way of specific embodiments. It should be understood by those skilled in the art that the embodiments are merely to help understand the present invention and should not be regarded as specific limitations of the present invention.

[0127] As used herein, the terms "comprises," "including," "having," "containing" or any other variations thereof, are intended to cover a non-exclusive inclusion. For example, a composition, process, method, article, or apparatus that comprises a listed element is not necessarily limited to only those elements but may include other elements not expressly listed or inherent to such composition, process, method, article, or apparatus.

[0128] In the following specific embodiments of the present invention, the materials used are all commercially available chemicals, and their specific information is as follows:

[0129] Brand factory PET PET YS-Y01 Hainan Yisheng Petrochemical Co., Ltd. PBT PBT 1200-211M Changchun Chemical Company fiberglass ECS10-03-568H China Jushi Co., Ltd. lubricant TR044W Struktol, Germany Antioxidant 1098 RIANOX 1098 Tianjin Li'anlong New Materials Co., Ltd. Antioxidant 168 RIANOX 168 Tianjin Li'anlong New Materials Co., Ltd.

[0130] The components of the flame retardant used in the following specific embodiments of the present invention are shown in Table 1. The dosage units of each component in Table 1 are all "parts by mass".

[0131] Table 1

[0132]

[0133] The aluminum dipropylphosphinate in Table 1 includes aluminum di-n-propylphosphinate and aluminum n-propylisopropylphosphinate, and the molar ratio of the two is 94.8:4.3; the various aluminum salts in Table 1 are all commercially available chemicals, or can be prepared by preparation methods known in the art.

[0134] Examples 1-11, Comparative Examples 1-8

[0135] A polyester composition, the types and amounts of the components are shown in Table 2 and Table 3, and the units of the amounts of the components are all "parts by mass".

[0136] The preparation method of the polyester composition comprises: placing all components except glass fiber and flame retardant in a mixer according to the formula amount, and mixing at a speed of 200 rpm for 3 minutes to obtain a premix; adding the premix into a twin-screw extruder from a main feeding port, adding glass fiber into the twin-screw extruder from a first side feeding port, and adding the flame retardant into the twin-screw extruder from a second side feeding port, melt-blending, and then extruding, granulating, drying and cooling to obtain the polyester composition; wherein the screw speed of the twin-screw extruder is 300 rpm, and the temperatures from the feeding section to the die are 90° C., 180° C., 240° C., 240° C., 210° C., 210° C., 210° C., 210° C., 210° C., 230° C., and 240° C., respectively.

[0137] The polyester composition was subjected to the following performance tests:

[0138] (1) Flame retardancy: 125 mm × 13 mm × 1.6 mm and 125 mm × 13 mm × 0.8 mm strips were prepared by injection molding and tested according to the method in ANSI / UL-94-1985.

[0139] (2) Deflection: The material was made into 80 mm × 20 mm × 4 mm strips and tested according to the method in standard GB / T9341-2008;

[0140] The test data are shown in Tables 2 and 3.

[0141] Table 2

[0142]

[0143]

[0144] Table 3

[0145]

[0146]

[0147] Combined with the above performance test data, it can be seen that the present invention can synergistically enhance the flame retardant effect of the flame retardant through the design of the phosphonate and the compounding with a specific dosage, so that the polyester composition containing it not only has excellent flame retardant properties, achieving V0 level flame retardancy for 1.6mm plate and V0-V1 level flame retardancy for 0.8mm plate, but also has a deflection ≥5.4, and has excellent toughness and bending properties.

[0148] Comparison of the data in Tables 2 and 3 reveals that flame retardants D1-D6 do not contain the combination of the four phosphonate types specified herein, or the phosphonate dosage ratios exceed the scope of the present invention. This hinders the synergistic flame retardant effect between the components, resulting in reduced flame retardancy in the polyester compositions of Comparative Examples 1-6. The polyester compositions of Comparative Examples 7 and 8, which increase the amount of flame retardant, exhibit improved flame retardancy, but exhibit decreased deflection, resulting in deterioration in toughness and bending properties.

[0149] The applicant states that while the polyester composition and its applications are illustrated by the aforementioned embodiments, the present invention is not limited to these embodiments, nor does it necessarily rely on these embodiments for implementation. Persons skilled in the art will appreciate that any improvements to the present invention, equivalent substitutions for raw materials in the products of the present invention, addition of auxiliary ingredients, and selection of specific methods, etc., fall within the scope of protection and disclosure of the present invention.

Claims

1. A polyester composition, characterized in that The polyester composition comprises the following components in parts by mass: 40-99.5 parts of polyester resin 5-35 parts of flame retardant; Based on 100 parts by weight of the flame retardant, the flame retardant comprises the following components: The dialkyl phosphinate has a structure as shown in Formula I, and the alkyl phosphinate has a structure as shown in Formula II: wherein R1, R2, and R3 are each independently selected from any one of a substituted or unsubstituted C2-C8 straight or branched alkyl group, a substituted or unsubstituted C3-C8 cycloalkyl group, and a substituted or unsubstituted C6-C18 aryl group; The total number of carbon atoms in R1 and R2 is ≥ 6; The substituents in R1, R2, and R3 are each independently selected from at least one of a C1-C8 straight or branched chain alkyl group and a C6-C18 aryl group; M1 m+ Indicates +m ion, M2 n+ Indicates +n valence ions; m and n are each independently selected from integers of 2-4.

2. The polyester composition according to claim 1, characterized in that The polyester resin includes any one of polyethylene terephthalate, polypropylene terephthalate, polybutylene terephthalate, poly-1,4-cyclohexanedimethanol terephthalate, polyethylene 2,6-naphthalate, and polybutylene 2,6-naphthalate, or a combination of at least two thereof, preferably polyethylene terephthalate and / or polybutylene terephthalate.

3. The polyester composition according to claim 1, characterized in that The R1 and R2 are each independently selected from any one of a substituted or unsubstituted C2-C8 straight or branched alkyl group, a substituted or unsubstituted C3-C6 cycloalkyl group, and a substituted or unsubstituted phenyl group; the substituents in R1 and R2 are each independently selected from at least one of a C1-C6 straight or branched alkyl group and a phenyl group; Preferably, R1 and R2 are each independently selected from any one of ethyl, n-propyl, isopropyl, n-butyl, isobutyl, sec-butyl, phenethyl, phenylpropyl, phenylbutyl, pentyl, 2-methylpentyl, 2-ethylpentyl, hexyl, 2-methylhexyl, 2-ethylhexyl, cyclohexyl, methylcyclohexyl, dimethylcyclohexyl, ethylcyclohexyl, heptyl, octyl, phenyl, methylphenyl, and dimethylphenyl; Preferably, the total number of carbon atoms in R1 and R2 is 6-14, more preferably 8-12.

4. The polyester composition according to claim 1, characterized in that The dialkyl phosphinate comprises a combination of a dialkyl phosphinate A having a structure shown in formula IA and an ethyl butyl phosphinate having a structure shown in formula IB; Wherein, M1 and m have the same definitions as in Formula I; R1' and R2' are each independently selected from any one of a substituted or unsubstituted C2-C8 straight or branched alkyl group, a substituted or unsubstituted C3-C8 cycloalkyl group, and a substituted or unsubstituted C6-C18 aryl group; The total number of carbon atoms in R1' and R2' is ≥6, and when one of R1' and R2' is ethyl, the other is not butyl; The substituents in R1' and R2' are each independently selected from at least one of a C1-C8 straight or branched alkyl group and a C6-C18 aryl group; Preferably, R1' and R2' are each independently selected from any one of ethyl, n-propyl, isopropyl, n-butyl, isobutyl, sec-butyl, phenethyl, phenylpropyl, phenylbutyl, pentyl, 2-methylpentyl, 2-ethylpentyl, hexyl, 2-methylhexyl, 2-ethylhexyl, cyclohexyl, methylcyclohexyl, dimethylcyclohexyl, ethylcyclohexyl, heptyl, octyl, phenyl, methylphenyl, and dimethylphenyl, and more preferably any one of n-propyl, isopropyl, n-butyl, isobutyl, sec-butyl, hexyl, cyclohexyl, methylcyclohexyl, and phenyl; Preferably, the dialkyl phosphinate A comprises ethylpentylphosphinate, ethylhexylphosphinate, hexyloctylphosphinate, ethylcyclohexylphosphinate, ethylphenylphosphinate, ethylphenylethylphosphinate, ethylheptylphosphinate, dipropylphosphinate, propylbutylphosphinate, propylpentylphosphinate, propylhexylphosphinate, hexyloctylphosphinate, propylcyclohexylphosphinate, propylphenylphosphinate, propylphenylpropylphosphinate, propylheptylphosphinate, dibutylphosphinate, butylpentylphosphinate, butylhexylphosphinate, hexyloctylphosphinate, butylcyclohexylphosphinate, butylphenylphosphinate any one or a combination of at least two of di-n-propyl phosphinate, n-propyl isopropyl phosphinate, diisopropyl phosphinate, di-n-butyl phosphinate, diisobutyl phosphinate, n-butyl isobutyl phosphinate, di-sec-butyl phosphinate, n-butyl sec-butyl phosphinate, isobutyl sec-butyl phosphinate, n-butyl cyclohexyl phosphinate, isobutyl cyclohexyl phosphinate, dicyclohexyl phosphinate, di-n-hexyl phosphinate, and diphenyl phosphinate; further preferably any one or a combination of at least two of di-n-propyl phosphinate, n-propyl isopropyl phosphinate, diisopropyl phosphinate, di-n-butyl phosphinate, diisobutyl phosphinate, n-butyl isobutyl phosphinate, di-sec-butyl phosphinate, n-butyl sec-butyl phosphinate, isobutyl sec-butyl phosphinate, n-butyl cyclohexyl phosphinate, isobutyl cyclohexyl phosphinate, dicyclohexyl phosphinate, di-n-hexyl phosphinate, and diphenyl phosphinate; Preferably, based on 100 parts by total mass of the flame retardant, the flame retardant comprises 5-60 parts of dialkyl phosphinate A; Preferably, based on 100 parts by total mass of the flame retardant, the flame retardant comprises 0.05-7 parts of ethylbutylphosphinate.

5. The polyester composition according to claim 1, characterized in that R3 is selected from any one of C2-C6 straight or branched alkyl, C3-C6 cycloalkyl, and phenyl, preferably any one of n-butyl, isobutyl, hexyl, cyclohexyl, and phenyl; Preferably, the hydrocarbyl phosphinate includes any one of n-butyl phosphinate, isobutyl phosphinate, n-hexyl phosphinate, cyclohexyl phosphinate, and phenyl phosphinate, or a combination of at least two thereof.

6. The polyester composition according to claim 1, characterized in that The M1 is selected from any one of Al, Ca, Mg, Cu, Zn, Fe, and Ti, preferably Al; Preferably, M2 is selected from any one of Al, Ca, Mg, Cu, Zn, Fe, and Ti, and Al is more preferred.

7. The polyester composition according to claim 1, characterized in that Based on 100 parts of the total mass of the flame retardant, the flame retardant further comprises 0.01-25 parts of phosphite; Preferably, the phosphite includes any one of aluminum phosphite, calcium phosphite, magnesium phosphite, copper phosphite, zinc phosphite, iron phosphite, and titanium phosphite, or a combination of at least two of them.

8. The polyester composition according to claim 1, characterized in that The polyester composition further comprises 10-45 parts by mass of a reinforcing material; Preferably, the reinforcing material comprises glass fiber and / or carbon fiber, more preferably glass fiber; Preferably, the polyester composition further comprises 0.01-1 parts by mass of an antioxidant; Preferably, the polyester composition further comprises 0.01-1 parts by mass of a lubricant.

9. The polyester composition according to claim 1, characterized in that The polyester composition further comprises any one of a filler, a synergistic flame retardant, a colorant, an ultraviolet absorber, and a toughening agent, or a combination of at least two thereof.

10. Use of the polyester composition according to any one of claims 1 to 9 in automotive parts, energy storage devices, connectors or electronic appliances.

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