WO2017177922A1 - 一种液晶聚酯组合物 - Google Patents

一种液晶聚酯组合物 Download PDF

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Publication number
WO2017177922A1
WO2017177922A1 PCT/CN2017/080252 CN2017080252W WO2017177922A1 WO 2017177922 A1 WO2017177922 A1 WO 2017177922A1 CN 2017080252 W CN2017080252 W CN 2017080252W WO 2017177922 A1 WO2017177922 A1 WO 2017177922A1
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Prior art keywords
liquid crystal
crystal polyester
polyester composition
ppm
sample
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PCT/CN2017/080252
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English (en)
French (fr)
Inventor
李闻达
孙华伟
肖中鹏
曹民
罗德彬
许柏荣
周广亮
姜苏俊
曾祥斌
黄险波
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Kingfa Science and Technology Co Ltd
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Kingfa Science and Technology Co Ltd
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    • C—CHEMISTRY; METALLURGY
    • C08—ORGANIC MACROMOLECULAR COMPOUNDS; THEIR PREPARATION OR CHEMICAL WORKING-UP; COMPOSITIONS BASED THEREON
    • C08G—MACROMOLECULAR COMPOUNDS OBTAINED OTHERWISE THAN BY REACTIONS ONLY INVOLVING UNSATURATED CARBON-TO-CARBON BONDS
    • C08G63/00—Macromolecular compounds obtained by reactions forming a carboxylic ester link in the main chain of the macromolecule
    • C08G63/02—Polyesters derived from hydroxycarboxylic acids or from polycarboxylic acids and polyhydroxy compounds
    • C08G63/60—Polyesters derived from hydroxycarboxylic acids or from polycarboxylic acids and polyhydroxy compounds derived from the reaction of a mixture of hydroxy carboxylic acids, polycarboxylic acids and polyhydroxy compounds
    • C—CHEMISTRY; METALLURGY
    • C08—ORGANIC MACROMOLECULAR COMPOUNDS; THEIR PREPARATION OR CHEMICAL WORKING-UP; COMPOSITIONS BASED THEREON
    • C08G—MACROMOLECULAR COMPOUNDS OBTAINED OTHERWISE THAN BY REACTIONS ONLY INVOLVING UNSATURATED CARBON-TO-CARBON BONDS
    • C08G63/00—Macromolecular compounds obtained by reactions forming a carboxylic ester link in the main chain of the macromolecule
    • C08G63/02—Polyesters derived from hydroxycarboxylic acids or from polycarboxylic acids and polyhydroxy compounds
    • C08G63/60—Polyesters derived from hydroxycarboxylic acids or from polycarboxylic acids and polyhydroxy compounds derived from the reaction of a mixture of hydroxy carboxylic acids, polycarboxylic acids and polyhydroxy compounds
    • C08G63/605—Polyesters derived from hydroxycarboxylic acids or from polycarboxylic acids and polyhydroxy compounds derived from the reaction of a mixture of hydroxy carboxylic acids, polycarboxylic acids and polyhydroxy compounds the hydroxy and carboxylic groups being bound to aromatic rings
    • C—CHEMISTRY; METALLURGY
    • C08—ORGANIC MACROMOLECULAR COMPOUNDS; THEIR PREPARATION OR CHEMICAL WORKING-UP; COMPOSITIONS BASED THEREON
    • C08K—Use of inorganic or non-macromolecular organic substances as compounding ingredients
    • C08K3/00—Use of inorganic substances as compounding ingredients
    • C08K3/10—Metal compounds
    • C08K3/14—Carbides
    • C—CHEMISTRY; METALLURGY
    • C08—ORGANIC MACROMOLECULAR COMPOUNDS; THEIR PREPARATION OR CHEMICAL WORKING-UP; COMPOSITIONS BASED THEREON
    • C08K—Use of inorganic or non-macromolecular organic substances as compounding ingredients
    • C08K5/00—Use of organic ingredients
    • C08K5/04—Oxygen-containing compounds
    • C08K5/09—Carboxylic acids; Metal salts thereof; Anhydrides thereof
    • C08K5/098—Metal salts of carboxylic acids
    • C—CHEMISTRY; METALLURGY
    • C08—ORGANIC MACROMOLECULAR COMPOUNDS; THEIR PREPARATION OR CHEMICAL WORKING-UP; COMPOSITIONS BASED THEREON
    • C08K—Use of inorganic or non-macromolecular organic substances as compounding ingredients
    • C08K5/00—Use of organic ingredients
    • C08K5/04—Oxygen-containing compounds
    • C08K5/10—Esters; Ether-esters
    • C08K5/101—Esters; Ether-esters of monocarboxylic acids
    • C—CHEMISTRY; METALLURGY
    • C08—ORGANIC MACROMOLECULAR COMPOUNDS; THEIR PREPARATION OR CHEMICAL WORKING-UP; COMPOSITIONS BASED THEREON
    • C08K—Use of inorganic or non-macromolecular organic substances as compounding ingredients
    • C08K7/00—Use of ingredients characterised by shape
    • C08K7/02—Fibres or whiskers
    • C08K7/04—Fibres or whiskers inorganic
    • C08K7/14—Glass
    • C—CHEMISTRY; METALLURGY
    • C08—ORGANIC MACROMOLECULAR COMPOUNDS; THEIR PREPARATION OR CHEMICAL WORKING-UP; COMPOSITIONS BASED THEREON
    • C08L—COMPOSITIONS OF MACROMOLECULAR COMPOUNDS
    • C08L67/00—Compositions of polyesters obtained by reactions forming a carboxylic ester link in the main chain; Compositions of derivatives of such polymers
    • C—CHEMISTRY; METALLURGY
    • C09—DYES; PAINTS; POLISHES; NATURAL RESINS; ADHESIVES; COMPOSITIONS NOT OTHERWISE PROVIDED FOR; APPLICATIONS OF MATERIALS NOT OTHERWISE PROVIDED FOR
    • C09K—MATERIALS FOR MISCELLANEOUS APPLICATIONS, NOT PROVIDED FOR ELSEWHERE
    • C09K19/00—Liquid crystal materials
    • C09K19/04—Liquid crystal materials characterised by the chemical structure of the liquid crystal components, e.g. by a specific unit
    • C09K19/38—Polymers
    • C09K19/3804—Polymers with mesogenic groups in the main chain
    • C09K19/3809—Polyesters; Polyester derivatives, e.g. polyamides
    • C—CHEMISTRY; METALLURGY
    • C08—ORGANIC MACROMOLECULAR COMPOUNDS; THEIR PREPARATION OR CHEMICAL WORKING-UP; COMPOSITIONS BASED THEREON
    • C08L—COMPOSITIONS OF MACROMOLECULAR COMPOUNDS
    • C08L2201/00—Properties
    • C08L2201/08—Stabilised against heat, light or radiation or oxydation

Definitions

  • the present invention relates to the field of polymer materials, and in particular to a liquid crystal polyester composition.
  • liquid crystal polyester As a special engineering material, liquid crystal polyester (LCP) has higher melting point and high heat stability than general-purpose resin. However, liquid crystal polyester still has thermal decomposition or external force when processed at high temperature. Thermal shearing and molecular chain scission lead to a decline in performance in all aspects. In order to improve the heat resistance stability of liquid crystal polyesters, many attempts have been made by those skilled in the art.
  • US 5,539,502 discloses a liquid crystal polymer composition having improved heat stability, the composition comprising 15 to 3000 ppm of an alkali metal or 50 to 3000 ppm of magnesium or calcium; and a liquid crystal polymer containing p-hydroxybenzoic acid, hydroquinone, and a combination Resorcinol, terephthalic acid, 2,6-naphthalene dicarboxylic acid and phthalic acid repeating units.
  • the introduction of the metal substance increases the melting point and heat distortion temperature of the composition, and the heat resistance is improved.
  • the liquid crystal polymer is contacted with the functional compound at a high temperature for a time sufficient for the melt viscosity to decrease by at least 10%.
  • CN1234749 discloses a liquid crystal polyester resin in which a repeating unit containing 4-hydroxyisophthalic acid and/or salicylic acid is used as a copolymerization component, and contains 10 to 5000 ppm of an alkali metal compound, and is called a coloring property of the resin. Excellent, high heat resistance, and good mechanical properties.
  • This invention primarily focuses on the improvement of the coloration and impact properties of liquid crystal polyesters, and does not clarify whether the heat resistance has changed in the examples or other parts of the patent. And this patent does not describe whether the invention is suitable for use in a liquid crystal polyester composition.
  • No. 6,755,991 discloses a liquid crystal polyester composition
  • a liquid crystal polyester composition comprising at least one aromatic dicarboxylic acid, at least one naphthalene containing carboxylic acid and from 1 to 1000 ppm of at least one alkali metal and from 0 to 3000 ppm of at least one transition metal.
  • the liquid crystal polyester composition prepared by the invention has improved whiteness and impact strength, and does not mention whether the high temperature heat resistance stability is changed.
  • the inventors have surprisingly found through a large number of experiments that metal is added to the formulation of the liquid crystal polyester composition.
  • the weight content of the chromium element is from 0.1 ppm to 500 ppm based on the total weight of the liquid crystal polyester composition, the high temperature heat resistance stability of the obtained liquid crystal polyester composition is unexpectedly remarkably improved.
  • a liquid crystal polyester composition having a metal chromium element content of from 0.1 ppm to 500 ppm by weight based on the total weight of the liquid crystal polyester composition.
  • the weight content of the metallic chromium element is preferably from 0.5 ppm to 300 ppm, more preferably from 1 ppm to 100 ppm, based on the total weight of the liquid crystal polyester composition.
  • the method for testing the weight content of metallic chromium element drying the liquid crystal polyester composition at 120 ° C for 4 hours, taking 1 g of the sample to be treated, adding nitric acid and hydrogen peroxide, heating for 2 hours, continuously adding nitric acid and hydrogen peroxide; the digestion of the sample Upon completion, the sample was removed and the weight content of metallic chromium in the sample was analyzed using Agilent's Model 720ES fully automated inductively coupled plasma atomic emission spectrometer.
  • the introduction of metallic chromium is usually achieved by adding a chromium-containing compound selected from the group consisting of sodium chromate, strontium chromate, lead chromate, strontium chromate, ammonium chromate, silver chromate, and the like.
  • Dichromate such as potassium dichromate or ammonium dichromate, which may also be chromic chloride, chromium (III) acetate, chromium sulfate, chromium nitrate, chromium phosphate, chromium acetate, chromium carbide, chromium potassium oxalate, three
  • An inorganic compound such as chromium fluoride, chromium trioxide, chromium chloride or chromium chloride hexahydrate may also be bis(triphenylsilyl) chromate, tetrabutylammonium chlorochromate or dichromic acid.
  • the source of the metallic chromium element indicated by the present invention is not limited to the above examples, regardless of which form of chromiumation is used. Compounds can be detected by atomic emission spectrometry.
  • the weight content of the metallic chromium element is based on the metallic chromium element itself rather than the chromium-containing compound to which the metallic chromium element is added.
  • the weight content of the metallic chromium element expressed in ppm is calculated based on the total weight of the liquid crystal polyester composition.
  • the liquid crystal polyester composition of the present invention may further comprise a metal lanthanum element, and the metal cerium element is contained in an amount of from 0.1 ppm to 500 ppm by weight based on the total weight of the liquid crystal polyester composition, preferably from 1 ppm to 200 ppm.
  • the method for testing the weight content of the metal lanthanum element drying the liquid crystal polyester composition at 120 ° C for 4 hours, taking 1 g of the sample to be treated, adding nitric acid and hydrogen peroxide, heating for 2 hours, continuously adding nitric acid and hydrogen peroxide; the digestion of the sample After completion, the sample after the solution was removed, and the weight content of the metal lanthanum element in the sample was analyzed by Agilent's Model 720ES fully automatic inductively coupled plasma atomic emission spectrometer.
  • the introduction of the metal lanthanum element is usually achieved by adding a cerium-containing compound, which may be selected from barium titanate, cerium nitrate, cerium hydroxide, cerium zirconate, cerium citrate, cerium cerate, cerium chloroborate, sulfuric acid.
  • a cerium-containing compound which may be selected from barium titanate, cerium nitrate, cerium hydroxide, cerium zirconate, cerium citrate, cerium cerate, cerium chloroborate, sulfuric acid.
  • An inorganic compound such as barium strontium, barium manganate, barium perchlorate, barium periodate, barium triflate or barium carbonate may also be selected from barium 2-ethylhexanoate, barium acetylacetonate, and 2,4- Pentyl hexafluoropentane, cesium tert-butoxide, cesium isopropoxide, bis(6,6,7,7,8,8,8-heptafluoro-2,2-dimethyl-3,5-octyl
  • An organic compound such as ketone, guanidine, diphenylamine-4-sul
  • the source of the metal ruthenium element indicated by the present invention is not limited to the above examples, and it can be detected by atomic emission spectrometry regardless of which form of the ruthenium-containing compound is used.
  • the weight content of the metallic cerium element is based on the metallic cerium element itself rather than the cerium-containing compound to which the metallic cerium element is added.
  • the weight content of the metal lanthanum element expressed in ppm is calculated based on the total weight of the liquid crystal polyester composition.
  • the liquid crystal polyester composition of the present invention may further comprise a metal tin element, and the metal tin element is contained in an amount of from 0.1 ppm to 500 ppm by weight, based on the total weight of the liquid crystal polyester composition, preferably from 1 ppm to 200 ppm.
  • the method for testing the weight content of the metal tin element drying the liquid crystal polyester composition at 120 ° C for 4 hours, taking 1 g of the sample to be treated, adding nitric acid and hydrogen peroxide, heating for 2 hours, continuously adding nitric acid and hydrogen peroxide; the digestion of the sample Upon completion, the unresolved sample was removed and the weight content of the metallic tin element in the sample was analyzed using Agilent's Model 720ES fully automated inductively coupled plasma atomic emission spectrometer.
  • tin metal is usually achieved by adding a tin-containing compound, which may be selected from the group consisting of sodium stannate, potassium stannate, tin (IV) acetate, tin (II) oxide, tin (IV) oxide, and tin sulfide.
  • a tin-containing compound which may be selected from the group consisting of sodium stannate, potassium stannate, tin (IV) acetate, tin (II) oxide, tin (IV) oxide, and tin sulfide.
  • tin (II) tin (II) sulfate, tin oxalate, tin acetate, tin difluoride, tin tetrafluoride, stannous isooctylate, tin chloride,
  • An inorganic compound such as tin bromide or tin iodide may also be triphenyltin acetate, tricyclotin, 1-methyl-2-(tributyltin)pyrrole or 1-methyl-2-(tributyltinyl).
  • Imidazole 1-methyl-4-(tributyltinyl)-1H-pyrazole, 1-methyl-5-(tributyltin)imidazole, 2-(tributylstannyl)furan, 2-(tri-n-butyltin) Oxazole, 2-tributylstannylthiazole, 3-(tri-n-butyltin)pyridine, N-methyl-2-(tributyltin)fluorene, N-methyl-4-(tributyltinyl) Imidazole, butyl stannic acid, tributylvinyl tin, tributyltin hydride, tributyltin oxide, tributyltin isocyanate, trimethyl(tributylstannyl)silane, trimethyltin chloride, ethynyl tri-negative An organic compound such as butyltin, hexamethylditin, hexaphenylditin,
  • the source of the metallic tin element indicated by the present invention is not limited to the above examples, and it can be detected by atomic emission spectrometry regardless of which form of the tin-containing compound is used.
  • the weight content of the metallic tin element is based on the metallic tin element itself rather than the tin-containing compound to which the metallic tin element is added.
  • the weight content of the metallic tin element expressed in ppm is calculated based on the total weight of the liquid crystal polyester composition.
  • liquid crystal polyester composition comprises, by weight, the following components:
  • the liquid crystal polyester composition has a melting point of 150 ° C to 400 ° C; the melting point is tested by a NETZSCH DSC 200F3 differential scanning calorimeter DSC at a temperature of 20 ° C / min from room temperature
  • the temperature rise condition test was carried out, and after the endothermic peak temperature T m1 was observed, it was kept at a temperature 20 ° C higher than T m1 for 5 minutes, then cooled to room temperature under a temperature drop condition of 20 ° C / minute, and then again at 20 ° C / minute.
  • the temperature rise condition was measured, and the endothermic peak temperature T m2 observed at this time was the melting point of the liquid crystal polyester composition.
  • liquid crystal polyester by mole percentage, comprises the following repeating unit:
  • the repeating unit derived from the aromatic dicarboxylic acid is from 0 mol% to 35 mol%.
  • the liquid crystal polyester by mole percentage, comprises the following repeating unit:
  • the repeating unit derived from the aromatic dicarboxylic acid is from 0 mol% to 25 mol%.
  • the repeating unit derived from the aromatic hydroxycarboxylic acid is selected from the group consisting of a repeating unit derived from 4-hydroxybenzoic acid and/or a repeating unit of 2-hydroxy-6-naphthoic acid; the derived from an aromatic diol Repeat unit selection a repeating unit derived from hydroquinone and/or a repeating unit of 4,4′-dihydroxybiphenyl; the repeating unit derived from an aromatic dicarboxylic acid is selected from the group consisting of repeating units of terephthalic acid, isophthalic acid One or more of the repeating unit, the repeating unit of 2,6-naphthalenedicarboxylic acid.
  • a repeating unit derived from an aromatic hydroxycarboxylic acid, a repeating unit derived from an aromatic diol, and an aromatic second are respectively added according to a ratio.
  • the temperature is refluxed for 1 hour to 3 hours; thereafter, the temperature is further increased, and the mixture is heated from 140 ° C to 160 ° C to 300 ° C to 350 ° C over 2 hours to 4 hours, during which unreacted acetic anhydride and side reactions are distilled off.
  • the product is acetic acid; in the final polycondensation stage, the reaction system is depressurized, and it is judged by observing the increase of the torque as the end point of the reaction; at this time, the prepolymer in the melt state is discharged through the discharge port and cooled to room temperature; The prepolymer is transferred to a solid phase polymerization apparatus, and the temperature is raised from room temperature to 260 ° C to 280 ° C over 5 hours to 7 hours, and the solid phase polymerization is carried out at this temperature for 9 hours to 11 hours; The product was derived to obtain a liquid crystal polyester.
  • the filler is selected from the group consisting of fibrous fillers and/or plate fillers;
  • the fibrous filler is selected from the group consisting of glass fibers, asbestos fibers, silica fibers, silica-alumina fibers, and potassium titanate.
  • the plate-shaped filler is selected from one or more of talc, mica, graphite, kaolin; preferably mica.
  • the glass fiber has a number average fiber diameter of from 3 micrometers to 30 micrometers, a number average aspect ratio of 5 or more, a number average fiber length of 50 micrometers to 3000 micrometers; and an average particle diameter of the mica of 0.5 micrometers - 200 microns.
  • a filler When a filler is added, more than 100 parts by weight of a filler is added to 100 parts by weight of the liquid crystal polyester, and the mechanical strength of the liquid crystal polyester composition may be lowered.
  • the method of adding the filler is not particularly limited, and a method well known in the art can be cited.
  • various known additives may be added to the liquid crystal polyester composition used in the present invention in an amount which does not impair the object of the present invention; various additives may be selected from plasticizers, stabilizers, and coloring agents. One or more of a agent, a lubricant, a mold release agent, and an antioxidant.
  • a suitable plasticizer is a phthalate.
  • Suitable stabilizers include organic phosphites such as triphenyl phosphite, tris-(2,6-dimethylphenyl) phosphite, tri-decylphenyl phosphite, dimethylphenylphosphonic acid Ester, trimethyl phosphate, etc., organic phosphite, alkylated monohydric or polyhydric phenol, alkylation reaction product of polyhydric phenol and diene, butylated reaction product of p-cresol or dicyclopentadiene , alkylated hydroquinones, hydroxylated thiodiphenyl ethers, alkylene-bisphenols, benzyl compounds, polyol esters, benzotriazoles, benzophenones Or a variety of combinations.
  • organic phosphites such as triphenyl phosphite, tris-(2,6-dimethylphenyl) phosphite, tri-decylphenyl
  • Suitable release agents include metal stearates, alkyl stearates, pentaerythritol stearate, paraffin, montan wax, and the like.
  • Suitable colorants include various pigments, dyes such as metal oxides of inorganic pigments and zinc oxides of mixed metal oxides, titanium oxide, iron oxides, sulfides such as zinc sulfide, etc.; aluminates, silicates, ferric acid Salt, etc., carbon black, ultramarine; organic pigments such as azo, diazo, anthraquinone, phthalocyanine, quinoline, naphthalene, ketone, azine, and the like.
  • Suitable lubricants include higher fatty acids, higher fatty esters, metal salts of higher fatty acids, and the like.
  • Suitable antioxidants include organic phosphites, alkylated monohydric or polyhydric phenols, alkylation products of polyphenols and dienes, butylated reaction products of p-cresol or dicyclopentadiene, alkane Alkalized hydroquinones, hydroxylated thiodiphenyl ethers, alkylene-bisphenols, benzyl compounds, polyol esters, and the like.
  • the various additives are not limited to the above, and may optionally contain other kinds of components which are not harmful to the thermal stability and physical properties of the liquid crystal polyester, as well as other substances commonly found in thermoplastic compositions, such as one or more kinds of polypropylene, Polyamide, polyester, polyphenylene sulfide, polyether ketone, polycarbonate, polyether sulfone, polyphenyl ether and modified substances thereof, thermoplastic resin such as polyetherimide, thermosetting resin such as phenolic resin, epoxy Resin, polyimide resin and cyanide resin.
  • thermoplastic resin such as polyetherimide, thermosetting resin such as phenolic resin, epoxy Resin, polyimide resin and cyanide resin.
  • the method of blending a filler, various additives, and the like in the liquid crystal polyester according to the embodiment of the present invention is not particularly limited, and a dry blending, a solution mixing method, a polymerization of a liquid crystal polyester, and a melt-kneading may be used.
  • melt kneading is preferred.
  • the temperature of the melt-kneading is not less than the melting point of the liquid crystal polyester, and the melting point is +50 ° C or lower.
  • a method of kneading a liquid crystal polyester, a filler, and various additives from a post-loading machine may be used; or a liquid crystal polyester and various additives may be introduced from a post-loading machine.
  • the liquid crystal polyester composition of the embodiment of the present invention is injection-molded, and is subjected to injection molding, compression molding, extrusion molding, blow molding, press molding, and the like.
  • the molded article described herein may be various molded articles such as injection molded articles, extrusion molded articles, press molded articles, sheets, tubes, unstretched films, uniaxially stretched films, and biaxially stretched films, and may be undrawn.
  • Various kinds of filaments such as stretched silk and super drawn yarn.
  • extrusion molding the effects of the present invention can be remarkably obtained, and therefore it is preferable.
  • the liquid crystal polyester composition obtained by the extrusion molding process has the following specific steps: liquid crystal polyester, filler, chromium-containing compound and/or antimony-containing compound and/or tin-containing compound, and/or each according to a ratio
  • the additives are uniformly mixed by a high-speed mixer, then added to a twin-screw extruder, melt-mixed at a screw speed of 280 RPM-320 RPM, and the temperature of the barrel is 290 ° C - 355 ° C.
  • Extrusion, cooling, pelletizing, and liquid crystal polymerization Ester composition Extrusion, cooling, pelletizing, and liquid crystal polymerization Ester composition.
  • the chromium-containing compound may be selected from the group consisting of sodium chromate, strontium chromate, lead chromate, strontium chromate, ammonium chromate, silver chromate, etc., dichromate such as potassium dichromate or ammonium dichromate. It may also be chromoyl chloride, chromium (III) acetate hydroxide, chromium sulfate, chromium nitrate, chromium phosphate, chromium acetate, chromium carbide, chromium potassium oxalate, chromium trifluoride, chromium trioxide, chromium chloride, chlorination.
  • An inorganic compound such as chromium hexahydrate may also be bis(triphenylsilyl) chromate, tetrabutylammonium chlorochromate, pyridinium dichromate, imidazole dichromate, quinoline dichromate, 2 , 2'-bipyridyl chlorochromic acid, 3-carboxypyridine dichromate, 4-carboxypyridine dichromate, tricarbonyl (N-toluidine) chromium, acetylacetonate chromium, hexacarbonyl chromium, benzene tricarbonyl chromium , (ethyl benzoate) chromium tricarbonyl (0), tris(2,2,6,6-tetramethyl-3,5-heptanedione) chromium (III), tris(acetonitrile) chromium tricarbonyl (0
  • the source of the metallic chromium element indicated by the present invention is not limited to the above examples, and any form of the chromium-containing compound can be detected by atomic emission spectrometry.
  • the weight content of the metallic chromium element is based on the metallic chromium element itself rather than the chromium-containing compound to which the metallic chromium element is added.
  • the weight content of the metallic chromium element expressed in ppm is calculated based on the total weight of the liquid crystal polyester composition.
  • the antimony-containing compound may be selected from the group consisting of barium titanate, barium nitrate, barium hydroxide, barium zirconate, barium strontium citrate, barium strontium silicate, barium chloroborate, barium sulfate, barium oxide, barium acetate, barium sulfide, barium nitrite, Barium metaphosphate, barium fluoride, barium chloride, barium thiosulfate, barium thiocyanate, barium iodate, barium tungstate, barium molybdate, barium chromate, barium manganate, barium perchlorate, periodate
  • An inorganic compound such as cerium, lanthanum triflate or cerium carbonate may also be selected from the group consisting of cerium 2-ethylhexanoate, cerium acetylacetonate, cerium pentoxide pentane, cerium tert-butoxide, and iso
  • the source of the element is not limited to the above examples, and no matter which form of the ruthenium-containing compound is used, it can be detected by atomic emission spectrometry.
  • the weight content of the metallic cerium element is based on the metallic cerium element itself rather than the cerium-containing compound to which the metallic cerium element is added.
  • the weight content of the metal lanthanum element expressed in ppm is calculated based on the total weight of the liquid crystal polyester composition.
  • the tin-containing compound may be selected from the group consisting of sodium stannate, potassium stannate, tin (IV) acetate, tin (II) oxide, tin (IV) oxide, tin (II) sulfide, tin (II) sulfate, tin oxalate, and tin acetate.
  • Inorganic compounds such as tin difluoride, tin tetrafluoride, stannous isooctylate, tin chloride, tin bromide, tin iodide, etc., may also be triphenyltin acetate, tricyclotin, 1-methyl-2 -(tributyltinyl)pyrrole, 1-methyl-2-(tributyltinyl)imidazole, 1-methyl-4-(tributyltinyl)-1H-pyrazole, 1-methyl-5-(tributyltin Imidazole, 2-(tributylstannyl)furan, 2-(tri-n-butyltinyl)oxazole, 2-tributylstannylthiazole, 3-(tri-n-butyltin)pyridine, N-methyl-2- (tributyltin) fluorene, N-methyl-4-(tributyltin)imidazole, buty
  • the source of the metallic tin element indicated by the present invention is not limited to the above examples, and it can be detected by atomic emission spectrometry regardless of which form of the tin-containing compound is used.
  • the weight content of the metallic tin element is based on the metallic tin element itself rather than the tin-containing compound to which the metallic tin element is added.
  • the weight content of the metallic tin element expressed in ppm is calculated based on the total weight of the liquid crystal polyester composition.
  • the molded article formed by the liquid crystal polyester composition obtained by the present invention can be applied to various gears, various housings, sensors, LED lamps, connectors, sockets, resistors, relay housings, relay bases, relays.
  • Enterprise electrical product parts office computer related parts, telephone related parts, transmission Machine-related parts, copier related parts, washing jig, oilless bearings, stern bearings, underwater bearings, and other bearings, motor parts, ignition order, as the representative of typewriter machine-related parts, microscope, binoculars, Optical equipment, precision mechanical related parts represented by cameras, clocks, etc.; various types of valves, fuels, and exhausts such as alternator terminals, alternator connectors, IC regulators, potentiometer bases for dimmers, exhaust valves, etc.
  • Gas, suction system various tubes, inlet nozzle snorkel, intake manifold, fuel pump, engine cooling water joint, vaporizer body, vaporizer separator, exhaust gas sensor, cooling water sensor, oil temperature sensor , throttle position sensor, crank position sensor, air flow meter, brake pad wear sensor, air conditioner thermostat base, air conditioner motor insulator, electric window and other automotive motor insulators, heater warm air flow control valve, radiator Motor brush holder, water pump impeller, turbine blade, wiper motor related components, distributor, starter switch, starter relay, transmission wiring harness, window washer nozzle, air conditioning panel switch substrate, fuel associated solenoid valve coil , fuse connector, horn terminal, electrical component insulation board, stepper motor rotor Lamps, lamp holders, lamp reflectors, lamp housings, brake pistons, solenoid line shafts, engine oil filters, ignition device housings, etc., automotive, vehicle-related components, etc., in printed wiring boards, small thin-walled electronic devices, etc. Especially useful.
  • the invention has the following beneficial effects:
  • the high-temperature heat-resistant stability of the obtained liquid crystal polyester composition is obtained by selecting the weight content of the metal chromium element in the liquid crystal polyester composition formulation to be 0.1 ppm-500 ppm based on the total weight of the liquid crystal polyester composition. Unexpectedly significant improvement.
  • Test method for the weight content of the metal chromium element drying the liquid crystal polyester composition at 120 ° C for 4 hours, taking 1 g of the sample to be treated, adding nitric acid and hydrogen peroxide, heating for 2 hours, continuously adding nitric acid and hydrogen peroxide; the digestion of the sample Upon completion, the sample was removed and the weight content of metallic chromium in the sample was analyzed using Agilent's Model 720ES fully automated inductively coupled plasma atomic emission spectrometer.
  • Test method for the weight content of the metal lanthanum element drying the liquid crystal polyester composition at 120 ° C for 4 hours, taking 1 g of the sample to be treated, adding nitric acid and hydrogen peroxide, heating for 2 hours, continuously adding nitric acid and hydrogen peroxide; and digesting the sample After completion, the sample after the solution was removed, and the weight content of the metal lanthanum element in the sample was analyzed by Agilent's Model 720ES fully automatic inductively coupled plasma atomic emission spectrometer.
  • Test method for the weight content of the metal tin element drying the liquid crystal polyester composition at 120 ° C for 4 hours, taking 1 g of the sample to be treated, adding nitric acid and hydrogen peroxide, heating for 2 hours, continuously adding nitric acid and hydrogen peroxide; the digestion of the sample After the completion, cancel the sample after the solution, using Agilent model 720ES
  • the fully automated inductively coupled plasma atomic emission spectrometer analyzes the weight content of metallic tin in the sample.
  • Test Method for Melt Viscosity of the Liquid Crystal Polyester Composition The liquid crystal polyester composition was tested using a Dynisco LCR 7000 capillary rheometer at a test temperature of liquid crystal polyester composition at a melting point of +20 ° C and a shear rate of 1000 seconds. -1 , using a die with an inner diameter of 1 mm and a length of 40 mm.
  • Test method for melting point of the liquid crystal polyester composition by using a NETZSCH DSC 200F3 type differential scanning calorimeter (DSC), the endothermic peak temperature T was observed at a temperature rise condition of 20 ° C / min from room temperature. After m1 , it was kept at a temperature 20 ° C higher than T m1 for 5 minutes, then cooled to room temperature under a temperature drop condition of 20 ° C / minute, and then measured again at a temperature rising condition of 20 ° C / minute, at which time the observed absorption was observed.
  • the heat peak temperature T m2 is the melting point of the liquid crystal polyester composition.
  • Test method for high temperature heat resistance stability of the liquid crystal polyester composition after drying the liquid crystal polyester composition at 120 ° C for 4 hours, it is added to a HAAKE Polylab OS type internal mixer for mixing, and the temperature is higher than that of the liquid crystal polyester.
  • the melting point of the composition is 20 ° C higher, the rotation speed of the rotor is 50 rpm, and the mixing time is 1 hour; after the completion of the mixing, the molten liquid crystal polyester composition is taken out from the internal mixer and cooled to room temperature; the same sample is dense.
  • the filler (such as glass fiber, talc, etc.) contained in the composition has no influence on the heat resistance of the liquid crystal polyester composition, and at a high temperature, the polymer thermally decomposes to break the molecular chain and lower the molecular weight.
  • the mechanism for adding a chromium-containing compound to a liquid crystal polyester composition to improve the heat resistance of the liquid crystal polyester composition is not fully understood, and it may be that a metal ion forms a complex with a macromolecule to make the structure more stable; it may also be a metal ion. It has a catalytic effect on the molecular chain growth. At high temperature, the molecular chain growth rate is close to the molecular chain rupture rate, which makes the macromolecular structure as a whole stable.
  • HBA 4-hydroxybenzoic acid
  • TA Terephthalic acid
  • IA Isophthalic acid
  • HNA 2-hydroxy-6-naphthoic acid
  • NDA 2,6-naphthalenedicarboxylic acid
  • the chromium-containing compound used in the present invention is a chromium-containing compound used in the present invention.
  • Chromium Carbide Sigma-Aldrich (Shanghai) Trading Co., Ltd.;
  • Chromium acetate Sigma-Aldrich (Shanghai) Trading Co., Ltd.;
  • Chromium acetylacetonate Sigma-Aldrich (Shanghai) Trading Co., Ltd.;
  • Tin Oxide (IV) Sigma-Aldrich (Shanghai) Trading Co., Ltd.;
  • the glass fiber used in the present invention grade CS03JAPX-1, number average fiber diameter 10 micrometers, number average aspect ratio 300, number average fiber length 3000 micrometers, Asahi Fiber Glass Co., Ltd.
  • a repeating unit derived from an aromatic hydroxycarboxylic acid, a repeating unit derived from an aromatic diol, and an aromatic second are respectively added according to a ratio.
  • the temperature is refluxed for 1 hour to 3 hours; thereafter, the temperature is further increased, and the mixture is heated from 140 ° C to 160 ° C to 300 ° C to 350 ° C over 2 hours to 4 hours, during which unreacted acetic anhydride and side reactions are distilled off.
  • the product is acetic acid; in the final polycondensation stage, the reaction system is depressurized, and it is judged by observing the increase of the torque as the end point of the reaction; at this time, the prepolymer in the melt state is discharged through the discharge port and cooled to room temperature; The prepolymer is transferred to a solid phase polymerization apparatus, and the temperature is raised from room temperature to 260 ° C to 280 ° C over 5 hours to 7 hours, and the solid phase polymerization is carried out at this temperature for 9 hours to 11 hours; The product was derived to obtain a liquid crystal polyester.
  • the liquid crystal polyester, the filler, the chromium-containing compound and/or the ruthenium-containing compound and/or the tin-containing compound prepared by the examples A1 to A4, and/or various additives are uniformly mixed by a high-speed mixer according to the ratio of Table 2. , adding a twin-screw extruder, melt mixing at a screw speed of 280 RPM-320 RPM, a barrel temperature of 290 ° C - 355 ° C, extrusion, cooling, pelletizing, that is, a liquid crystal polyester composition.
  • the melting point, melt viscosity and specific volume logarithmic viscosity of the obtained liquid crystal polyester composition are listed in Table 2;
  • the content of the metal chromium element, the metal lanthanum element, and the metal tin element in the liquid crystal polyester composition is carried out by the actual addition amount of the chromium-containing compound, the cerium-containing compound, and the tin-containing compound in the preparation process of the liquid crystal polyester composition. Adjusted and measured.

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Abstract

本发明公开了一种液晶聚酯组合物，基于液晶聚酯组合物的总重量，金属铬元素的重量含量为0.1ppm-500ppm。所述金属铬元素的重量含量的测试方法：将液晶聚酯组合物在120℃干燥4小时，取1g待处理样品，加入硝酸和双氧水，加热2小时，期间不断加入硝酸和双氧水；样品的消解完成后，取消解后的试样，采用Agilent公司型号为720ES的全自动电感耦合等离子体原子发射光谱仪分析样品中金属铬元素的重量含量。本发明通过选用在液晶聚酯组合物配方中添加金属铬元素的重量含量基于液晶聚酯组合物的总重量为0.1ppm-500ppm时，得到的液晶聚酯组合物的高温耐热稳定性得到意想不到的显著改善。

Description

一种液晶聚酯组合物 技术领域
本发明涉及高分子材料领域，特别涉及一种液晶聚酯组合物。
背景技术
液晶聚酯(LCP)作为一种特种工程类材料，与通用树脂相比，具有较高的熔点和高耐热稳定性，然而液晶聚酯仍然存在着在高温下加工时热分解或因受外力热剪切而分子链断链，导致各方面性能下降的现象。为了改善液晶聚酯的耐热稳定性，本领域专业人员做了许多尝试。
US5397502公开了一种耐热稳定性改善的液晶聚合物组合物，组合物包含15～3000ppm的碱金属或50～3000ppm的镁或钙；液晶聚合物含有对羟基苯甲酸、对苯二酚、联苯二酚、对苯二甲酸、2，6-萘二甲酸和联苯二甲酸重复单元。金属物质的引入提高了组合物的熔点及热变形温度，使耐热性得到改善。然而专利中提到使液晶聚合物与功能性化合物在高温下接触并持续足够长的时间使得其熔体粘度下降至少10％。本领域专业技术人员所公知，液晶树脂长时间在高于其熔融温度下处理，由于热分解会会导致熔体粘度和分子量的降低，由此带来的还有力学性能的下降，以及副反应的发生，这可能会增大树脂起泡的风险。
CN1234749公开了一种液晶聚酯树脂，其中含有4-羟基间苯二甲酸和/或水杨酸而来的重复单元作为共聚成分，而且含有10～5000ppm的碱金属化合物，并称树脂的着色性优良、耐热性高，且机械性好。该发明主要侧重液晶聚酯着色度和冲击性能的改善，并未在实施例或专利中其它部分阐明耐热性能是否有变化。且该专利并未说明发明是否适用于液晶聚酯组合物。
US6755991公开了一种液晶聚酯组合物，包含至少一种芳族二羧酸，至少一种含萘环羧酸以及1～1000ppm至少一种碱金属和0～3000ppm至少一种过渡金属。该发明制备的液晶聚酯组合物具有改进的白度和冲击强度，并未提及高温耐热稳定性是否变化。
到目前为止，关于在液晶聚酯组合物中添加金属铬元素对所述液晶聚酯组合物高温耐热稳定性的影响未见报道。
本发明人经过大量实验惊讶地发现，选用在液晶聚酯组合物配方中添加金属 铬元素的重量含量基于液晶聚酯组合物的总重量为0.1ppm-500ppm时，得到的液晶聚酯组合物的高温耐热稳定性得到意想不到的显著改善。
发明内容
为了克服现有技术的缺点与不足，本发明的首要目的在于提供一种高温耐热稳定性得到显著改善的液晶聚酯组合物。
本发明是通过如下技术方案实现的：
一种液晶聚酯组合物，基于液晶聚酯组合物的总重量，金属铬元素的重量含量为0.1ppm-500ppm。
优选地，基于液晶聚酯组合物的总重量，金属铬元素的重量含量优选为0.5ppm-300ppm，更优选为1ppm-100ppm。
其中，金属铬元素的重量含量的测试方法：将液晶聚酯组合物在120℃干燥4小时，取1g待处理样品，加入硝酸和双氧水，加热2小时，期间不断加入硝酸和双氧水；样品的消解完成后，取消解后的试样，采用Agilent公司型号为720ES的全自动电感耦合等离子体原子发射光谱仪分析样品中金属铬元素的重量含量。
目前尚未有文献报道在液晶聚酯组合物中引入金属铬元素对组合物性能的影响，本发明意外发现在液晶聚酯组合物中引入适量的铬元素，液晶聚酯组合物在高温环境下显现出惊人的耐热稳定性。而当液晶聚酯组合物中金属铬元素的重量含量超过特定值时，液晶组合物含有较高金属残留物质，势必会影响其作为电子电器类零部件的介电性能，大大缩小其使用范围，且流动性会出现显著的下降。
金属铬元素的引入通常是通过添加含铬化合物来实现的，含铬化合物可以选自铬酸钠、铬酸钡、铬酸铅、铬酸铯、铬酸铵、铬酸银等铬酸盐，重铬酸钾、重铬酸铵等重铬酸盐，也可以是铬酰氯、乙酸铬(III)氢氧化物、硫酸铬、硝酸铬、磷酸铬、乙酸铬、碳化铬、草酸铬钾、三氟化铬、三氧化二铬、氯化铬、氯化铬六水合物等无机化合物，也可以是铬酸双(三苯基甲硅烷基)酯、氯铬酸四丁基铵、重铬酸吡啶盐、重铬酸咪唑、重铬酸喹啉、2,2’-联吡啶氯铬酸、3-羧基吡啶重铬酸盐、4-羧基吡啶重铬酸盐、三羰基(N-甲苯胺)铬、乙酰丙酮铬、六羰基铬、苯三羰基铬、(苯甲酸乙酯)三羰基铬(0)、三(2,2,6,6-四甲基-3,5-庚二酮)铬(III)、三(乙腈)三羰基铬(0)、二羰基(五甲基环戊二烯基)铬二聚物、(苯甲酸甲酯)三羰基铬、双(乙基环戊二烯)铬(II)等有机化合物。本发明所指出的金属铬元素的来源不仅限于上述举例，无论使用哪种形式的含铬化 合物，都能够使用原子发射光谱法检测到。金属铬元素的重量含量是以金属铬元素本身而不是以添加金属铬元素的含铬化合物为基准的。以ppm表示的金属铬元素的重量含量是以液晶聚酯组合物的总重量为基准计算的。
本发明的液晶聚酯组合物还可以包括金属钡元素，基于液晶聚酯组合物的总重量，金属钡元素的重量含量为0.1ppm-500ppm，优选为1ppm-200ppm。
其中，金属钡元素的重量含量的测试方法：将液晶聚酯组合物在120℃干燥4小时，取1g待处理样品，加入硝酸和双氧水，加热2小时，期间不断加入硝酸和双氧水；样品的消解完成后，取消解后的试样，采用Agilent公司型号为720ES的全自动电感耦合等离子体原子发射光谱仪分析样品中金属钡元素的重量含量。
金属钡元素的引入通常是通过添加含钡化合物来实现的，含钡化合物可以选自钛酸钡、硝酸钡、氢氧化钡、锆酸钡、铈酸钡、铪酸钡、氯硼酸钡、硫酸钡、氧化钡、乙酸钡、硫化钡、亚硝酸钡、偏磷酸钡、氟化钡、氯化钡、硫代硫酸钡、硫氰酸钡、碘化钡、钨酸钡、钼酸钡、铬酸钡、锰酸钡、高氯酸钡、高碘酸钡、三氟甲磺酸钡、碳酸钡等无机化合物，也可以选自2-乙基己酸钡、乙酰丙酮钡、2,4-六氟化钡戊烷、叔丁醇钡、异丙氧基钡、二(6,6,7,7,8,8,8-七氟-2,2-二甲基-3,5-辛二酮)钡、二苯胺-4-磺酸钡、双(2,2,6,6-四甲基-3,5-庚二酮酸)钡、环己烷丁酸钡等有机化合物。本发明所指出的金属钡元素的来源不仅限于上述举例，无论使用哪种形式的含钡化合物，都能够使用原子发射光谱法检测到。金属钡元素的重量含量是以金属钡元素本身而不是以添加金属钡元素的含钡化合物为基准的。以ppm表示的金属钡元素的重量含量是以液晶聚酯组合物的总重量为基准计算的。
本发明的液晶聚酯组合物还可以包括金属锡元素，基于液晶聚酯组合物的总重量，金属锡元素的重量含量为0.1ppm-500ppm，优选为1ppm-200ppm。
其中，金属锡元素的重量含量的测试方法：将液晶聚酯组合物在120℃干燥4小时，取1g待处理样品，加入硝酸和双氧水，加热2小时，期间不断加入硝酸和双氧水；样品的消解完成后，取消解后的试样，采用Agilent公司型号为720ES的全自动电感耦合等离子体原子发射光谱仪分析样品中金属锡元素的重量含量。
金属锡元素的引入通常是通过添加含锡化合物来实现的，含锡化合物可以选自锡酸钠、锡酸钾、乙酸锡(IV)、氧化锡(II)、氧化锡(IV)、硫化锡(II)、硫酸锡(II)、草酸锡、醋酸锡、二氟化锡、四氟化锡、异辛酸亚锡、氯化锡、 溴化锡、碘化锡等无机化合物，也可以是三苯基乙酸锡、三环锡、1-甲基-2-(三丁基锡基)吡咯、1-甲基-2-(三丁基锡基)咪唑、1-甲基-4-(三丁基锡基)-1H-吡唑、1-甲基-5-(三丁基锡基)咪唑、2-(三丁基锡烷基)呋喃、2-(三正丁基锡基)噁唑、2-三丁基甲锡烷基噻唑、3-(三正丁基锡)吡啶、N-甲基-2-(三丁基锡基)吲哚、N-甲基-4-(三丁基锡基)咪唑、丁基锡酸、三丁基乙烯基锡、三丁基氢化锡、三丁基氧化锡、三丁基锡异氰酸酯、三甲基(三丁基锡烷基)硅烷、三甲基氯化锡、乙炔基三正丁基锡、六甲基二锡、六苯基二锡、四丁基锡、四乙基锡、四乙烯基锡、苯丁锡、三丁基(1-乙氧基乙烯)锡等有机化合物。本发明所指出的金属锡元素的来源不仅限于上述举例，无论使用哪种形式的含锡化合物，都能够使用原子发射光谱法检测到。金属锡元素的重量含量是以金属锡元素本身而不是以添加金属锡元素的含锡化合物为基准的。以ppm表示的金属锡元素的重量含量是以液晶聚酯组合物的总重量为基准计算的。
其中，所述液晶聚酯组合物，按重量份计，包括如下组分：
液晶聚酯                 100份；
填充剂                   5份-100份。
其中，所述液晶聚酯组合物的熔点为150℃-400℃；所述熔点的测试方法为：通过NETZSCH公司DSC 200F3型差示扫描量热仪DSC，在从室温开始以20℃/分钟的升温条件测试，观测到吸热峰温度Tm1后，在比Tm1高20℃的温度下保持5分钟，然后在20℃/分钟的降温条件下冷却至室温，然后再次以20℃/分钟的升温条件进行测定，此时观测到的吸热峰温度Tm2即为液晶聚酯组合物的熔点。
其中，所述液晶聚酯，按摩尔百分比计，包含如下重复单元：
衍生自芳香族羟基羧酸的重复单元     30mol％-100mol％；
衍生自芳香族二醇的重复单元         0mol％-35mol％；
衍生自芳香族二羧酸的重复单元       0mol％-35mol％。
优选地，所述液晶聚酯，按摩尔百分比计，包括如下重复单元：
衍生自芳香族羟基羧酸的重复单元     50mol％-100mol％；
衍生自芳香族二醇的重复单元         0mol％-25mol％；
衍生自芳香族二羧酸的重复单元       0mol％-25mol％。
其中，所述衍生自芳香族羟基羧酸的重复单元选自衍生自4-羟基苯甲酸的重复单元和/或2-羟基-6-萘甲酸的重复单元；所述衍生自芳香族二醇的重复单元选 自对苯二酚的重复单元和/或4,4’-二羟基联苯的重复单元；所述衍生自芳香族二羧酸的重复单元选自对苯二甲酸的重复单元、间苯二甲酸的重复单元、2,6-萘二甲酸的重复单元中一种或几种。
上述液晶聚酯的制备方法，可以采用本领域技术人员熟知的标准缩聚技术方法，包括如下步骤：
在装配有搅拌器、温度计、氮气导入管和回流冷凝装置的反应釜中按照配比分别加入衍生自芳香族羟基羧酸的重复单元、衍生自芳香族二醇的重复单元和衍生自芳香族二羧酸的重复单元，并加入一定比例的醋酸酐为酰化剂；然后将氮气通入反应釜中进行置换；开动搅拌，在氮气流中将反应混合物由室温加热到140℃-160℃，在此温度下回流1小时-3小时；此后继续升温，将混合物经2小时-4小时从140℃-160℃加热到300℃-350℃，在此过程中蒸出未反应的醋酸酐和副反应产物醋酸；终缩聚阶段，对反应体系进行减压，并通过观察扭矩升高作为反应结束的终点判断；此时将熔体状态的预聚物经放料口排出，并冷却至室温；进一步将预聚物转移至固相聚合装置，经5小时-7小时将温度由室温升高至260℃-280℃，在此温度下保温9小时-11小时进行固相聚合反应；反应结束后将产物导出，从而得到液晶聚酯。
其中，所述填充剂选自纤维状填充剂和/或板状填充剂；所述纤维状填充剂选自玻璃纤维、石棉纤维、二氧化硅纤维、二氧化硅-氧化铝纤维、钛酸钾纤维、碳或石墨纤维、金属纤维中的一种或几种；优选为玻璃纤维；所述板状填充剂选自滑石、云母、石墨、高岭土中的一种或几种；优选为云母。
优选地，所述玻璃纤维的数均纤维直径为3微米-30微米，数均长径比大于等于5，数均纤维长度为50微米-3000微米；所述云母的平均粒径为0.5微米-200微米。
当添加填充剂，相对于液晶聚酯100重量份，添加超过100份以上的填充剂，液晶聚酯组合物的机械强度可能降低。添加填充剂的方法不特别限制，并且可以列举在本领域中公知的方法。
此外，除了上述组分以外，可以以不损害本发明目的的量向本发明中使用的液晶聚酯组合物中加入公知的各种添加剂；各种添加剂可以选自增塑剂、稳定剂、着色剂、润滑剂、脱模剂、抗氧剂中的一种或几种。
合适的增塑剂为邻苯二甲酸酯。
合适的稳定剂包括有机亚磷酸酯，如亚磷酸三苯酯，亚磷酸三-(2,6-二甲基苯基)酯，亚磷酸三-壬基苯基酯，二甲基苯膦酸酯，磷酸三甲酯等，有机亚磷酸酯，烷基化的一元酚或者多元酚，多元酚和二烯的烷基化反应产物，对甲酚或者二环戊二烯的丁基化反应产物，烷基化的氢醌类，羟基化的硫代二苯基醚类，亚烷基-双酚，苄基化合物，多元醇酯类，苯并三唑类，二苯甲酮类的一种或者多种组合。
合适的脱模剂包括硬脂酸金属盐类，硬脂酸烷基酯类，硬脂酸季戊四醇酯类，石蜡，褐煤蜡等等。
合适的着色剂包括各种颜料，染料，如无机颜料的金属氧化物和混合金属氧化物的氧化锌，氧化钛，氧化铁，硫化物如硫化锌等；铝酸盐，硅酸盐，铁酸盐等，炭黑，群青；有机颜料如偶氮类，重氮类，蒽醌类、酞菁、喹啉类，萘，酮，嗪类等等。
合适的润滑剂包括高级脂肪酸、高级脂肪酯、高级脂肪酸的金属盐等。
合适的抗氧剂包括有机亚磷酸酯，烷基化的一元酚或者多元酚，多元酚和二烯的烷基化反应产物，对甲酚或者二环戊二烯的丁基化反应产物，烷基化的氢醌类，羟基化的硫代二苯基醚类，亚烷基-双酚，苄基化合物，多元醇酯类等。
各种添加剂不限于上述几种，可任选含有对液晶聚酯的热稳定性和物理性质无害的其它种类组分以及热塑性组合物中常见的其它物质，如一种或多种的聚丙烯、聚酰胺、聚酯、聚苯硫醚、聚醚酮、聚碳酸酯、聚醚砜、聚苯基醚及其改性物质，热塑性树脂如聚醚酰亚胺，热固性树脂如酚醛树脂、环氧树脂、聚酰亚胺树脂和氰化物树脂。
本发明的实施方式的液晶聚酯中配合填充剂、各种添加剂等的方法，没有特定的限定，可以使用干式掺混、溶液混合法、液晶聚酯的聚合是添加、熔融混炼等，其中优选为熔融混炼。如捏合机，单轴或双轴挤出机、胶辊机等，其中优选使用双轴挤出机。熔融混炼的温度为液晶聚酯的熔点以上，熔点+50℃以下。
作为混炼方法，可以使用从后装进料机一并投入液晶聚酯、填充剂、各种添加剂来进行混炼的方法；也可以从后装进料机透入液晶聚酯和各种添加剂，从侧进料机添加填充剂进行混炼的方法，亦可以制备高浓度包含液晶聚酯和各种添加剂的液晶聚酯组合物母粒，接着将液晶聚酯组合物母粒与填充剂进行混炼以成为规定的浓度的方法等的任一种方法。
本发明的实施方式的液晶聚酯组合物通过进行注射成型，注射压缩成型、压缩成型、挤出成型、吹塑成型、压制成型纺丝等公知的熔融成型品。这里所述的成型品，可以为注射成型品、挤出成型品、压制成型品、片、管、未拉伸薄膜、单轴拉伸薄膜、双轴拉伸薄膜等各种膜制品、未拉伸丝、超拉伸丝等各种纤维丝等。在挤出成型的情况下，可显著获得本发明的效果，因此优选。
其中，通过挤出成型工艺得到的液晶聚酯组合物，具体步骤如下：按照配比将液晶聚酯、填充剂、含铬化合物和/或含钡化合物和/或含锡化合物、和/或各种添加剂用高速混合机混合均匀后，加入双螺杆挤出机，在280RPM-320RPM的螺杆转速下熔融混合，螺筒温度为290℃-355℃，挤出，冷却、切粒，即得液晶聚酯组合物。
其中含铬化合物可以选自铬酸钠、铬酸钡、铬酸铅、铬酸铯、铬酸铵、铬酸银等铬酸盐，重铬酸钾、重铬酸铵等重铬酸盐，也可以是铬酰氯、乙酸铬(III)氢氧化物、硫酸铬、硝酸铬、磷酸铬、乙酸铬、碳化铬、草酸铬钾、三氟化铬、三氧化二铬、氯化铬、氯化铬六水合物等无机化合物，也可以是铬酸双(三苯基甲硅烷基)酯、氯铬酸四丁基铵、重铬酸吡啶盐、重铬酸咪唑、重铬酸喹啉、2,2’-联吡啶氯铬酸、3-羧基吡啶重铬酸盐、4-羧基吡啶重铬酸盐、三羰基(N-甲苯胺)铬、乙酰丙酮铬、六羰基铬、苯三羰基铬、(苯甲酸乙酯)三羰基铬(0)、三(2,2,6,6-四甲基-3,5-庚二酮)铬(III)、三(乙腈)三羰基铬(0)、二羰基(五甲基环戊二烯基)铬二聚物、(苯甲酸甲酯)三羰基铬、双(乙基环戊二烯)铬(II)等有机化合物。本发明所指出的金属铬元素的来源不仅限于上述举例，无论使用哪种形式的含铬化合物，都能够使用原子发射光谱法检测到。金属铬元素的重量含量是以金属铬元素本身而不是以添加金属铬元素的含铬化合物为基准的。以ppm表示的金属铬元素的重量含量是以液晶聚酯组合物的总重量为基准计算的。
其中含钡化合物可以选自钛酸钡、硝酸钡、氢氧化钡、锆酸钡、铈酸钡、铪酸钡、氯硼酸钡、硫酸钡、氧化钡、乙酸钡、硫化钡、亚硝酸钡、偏磷酸钡、氟化钡、氯化钡、硫代硫酸钡、硫氰酸钡、碘化钡、钨酸钡、钼酸钡、铬酸钡、锰酸钡、高氯酸钡、高碘酸钡、三氟甲磺酸钡、碳酸钡等无机化合物，也可以选自2-乙基己酸钡、乙酰丙酮钡、2,4-六氟化钡戊烷、叔丁醇钡、异丙氧基钡、二(6,6,7,7,8,8,8-七氟-2,2-二甲基-3,5-辛二酮)钡、二苯胺-4-磺酸钡、双(2,2,6,6-四甲基-3,5-庚二酮酸)钡、环己烷丁酸钡等有机化合物。本发明所指出的金属钡 元素的来源不仅限于上述举例，无论使用哪种形式的含钡化合物，都能够使用原子发射光谱法检测到。金属钡元素的重量含量是以金属钡元素本身而不是以添加金属钡元素的含钡化合物为基准的。以ppm表示的金属钡元素的重量含量是以液晶聚酯组合物的总重量为基准计算的。
其中含锡化合物可以选自锡酸钠、锡酸钾、乙酸锡(IV)、氧化锡(II)、氧化锡(IV)、硫化锡(II)、硫酸锡(II)、草酸锡、醋酸锡、二氟化锡、四氟化锡、异辛酸亚锡、氯化锡、溴化锡、碘化锡等无机化合物，也可以是三苯基乙酸锡、三环锡、1-甲基-2-(三丁基锡基)吡咯、1-甲基-2-(三丁基锡基)咪唑、1-甲基-4-(三丁基锡基)-1H-吡唑、1-甲基-5-(三丁基锡基)咪唑、2-(三丁基锡烷基)呋喃、2-(三正丁基锡基)噁唑、2-三丁基甲锡烷基噻唑、3-(三正丁基锡)吡啶、N-甲基-2-(三丁基锡基)吲哚、N-甲基-4-(三丁基锡基)咪唑、丁基锡酸、三丁基乙烯基锡、三丁基氢化锡、三丁基氧化锡、三丁基锡异氰酸酯、三甲基(三丁基锡烷基)硅烷、三甲基氯化锡、乙炔基三正丁基锡、六甲基二锡、六苯基二锡、四丁基锡、四乙基锡、四乙烯基锡、苯丁锡、三丁基(1-乙氧基乙烯)锡等有机化合物。本发明所指出的金属锡元素的来源不仅限于上述举例，无论使用哪种形式的含锡化合物，都能够使用原子发射光谱法检测到。金属锡元素的重量含量是以金属锡元素本身而不是以添加金属锡元素的含锡化合物为基准的。以ppm表示的金属锡元素的重量含量是以液晶聚酯组合物的总重量为基准计算的。
本发明所获得的液晶聚酯组合物形成的成型品可以有如下应用，以各种齿轮、各种壳体、传感器、LED灯、连接器、插座、电阻器、继电器壳体、继电器底座、继电器用绕线轴、开关、线圈轴、电容器、可变电容器壳体、光拾波器、共振器、各种端子板、变压器、插头、印刷布线板、调谐器、扬声器、传声器、头戴式听筒、小型电动机、磁头底座、功率模块、外壳、半导体、液晶显示器部件、FDD托架、FDD底盘、HDD部件、电动机刷握、抛物面天线、计算机相关部件等为代表的电气电子部件、以VTR部件、电视部件、熨斗、电吹风、电饭煲部件、微波炉部件、音响部件、音频、激光盘、光盘等语音设备部件、照明部件、电冰箱部件、空调部件、打字机部件、文字处理机部件等为代表的家庭、企业电气制品部件、办公室计算机相关部件、电话机相关部件、传真机相关部件、复印机相关部件、洗涤用夹具、无油轴承、船尾轴承、水中轴承等各种轴承、电动机部件、以点火器、打字机等为代表的机械相关部件、以显微镜、双筒望远镜、 照相机、钟表等为代表的光学设备、精密机械相关部件；交流发电机端子、交流发电机连接器、IC调节器、调光器用电位器底座、排气气阀等各种阀、燃料关联、排气系、吸气系的各种管、进气口喷嘴通气管、进气歧管、燃料泵、发动机冷却水接头、汽化器主体、汽化器隔离物、排气气体传感器、冷却水传感器、油温传感器、节气门位置传感器、曲轴位置传感器、空气流量计、制动衬块磨耗传感器、空调用恒温器底座、空调用电动机绝缘体、电动窗等车载用电动机绝缘体、取暖器暖风流量控制阀、散热器电动机用刷握、水泵叶轮、涡轮叶片、刮水器电动机相关部件、分电器、起动器开关、起动器继电器、传动装置用线束、窗户洗涤器喷嘴、空调面板开关基板、燃料关联电磁阀用线圈、保险丝用连接器、喇叭端子、电装部件绝缘板、步进电动机转子、灯圈、灯座、灯光反射器、灯壳、制动活塞、螺线管线轴、发动机滤油器、点火装置壳体等汽车、车辆相关部件等，在印刷布线板，小型薄壁电子器件等中特别有用。
本发明与现有技术相比，具有如下有益效果：
本发明通过选用在液晶聚酯组合物配方中添加金属铬元素的重量含量基于液晶聚酯组合物的总重量为0.1ppm-500ppm时，得到的液晶聚酯组合物的高温耐热稳定性得到意想不到的显著改善。
具体实施方式
下面通过具体实施方式来进一步说明本发明，以下实施例为本发明较佳的实施方式，但本发明的实施方式并不受下述实施例的限制。
所述金属铬元素的重量含量的测试方法：将液晶聚酯组合物在120℃干燥4小时，取1g待处理样品，加入硝酸和双氧水，加热2小时，期间不断加入硝酸和双氧水；样品的消解完成后，取消解后的试样，采用Agilent公司型号为720ES的全自动电感耦合等离子体原子发射光谱仪分析样品中金属铬元素的重量含量。
所述金属钡元素的重量含量的测试方法：将液晶聚酯组合物在120℃干燥4小时，取1g待处理样品，加入硝酸和双氧水，加热2小时，期间不断加入硝酸和双氧水；样品的消解完成后，取消解后的试样，采用Agilent公司型号为720ES的全自动电感耦合等离子体原子发射光谱仪分析样品中金属钡元素的重量含量。
所述金属锡元素的重量含量的测试方法：将液晶聚酯组合物在120℃干燥4小时，取1g待处理样品，加入硝酸和双氧水，加热2小时，期间不断加入硝酸和双氧水；样品的消解完成后，取消解后的试样，采用Agilent公司型号为720ES 的全自动电感耦合等离子体原子发射光谱仪分析样品中金属锡元素的重量含量。
所述液晶聚酯组合物的熔融粘度的测试方法：采用Dynisco LCR7000型毛细管流变仪对液晶聚酯组合物进行测试，测试温度为液晶聚酯组合物熔点+20℃，剪切速率为1000秒-1，使用内径1mm，长度40mm的口模测量。
所述液晶聚酯组合物的熔点的测试方法：通过NETZSCH公司DSC 200F3型差示扫描量热仪(DSC)，在从室温开始以20℃/分钟的升温条件测试，观测到吸热峰温度Tm1后，在比Tm1高20℃的温度下保持5分钟，然后在20℃/分钟的降温条件下冷却至室温，然后再次以20℃/分钟的升温条件进行测定，此时观测到的吸热峰温度Tm2为液晶聚酯组合物的熔点。
所述液晶聚酯组合物的比容对数粘度的测试方法：将液晶聚酯组合物溶解于五氟苯酚中，将玻纤过滤掉，然后制成浓度为0.01g/mL的溶液，测试温度为60℃，采用内径为0.7mm的乌氏粘度计测量；并由公式：比容对数粘度＝[ln(ηr)]/C计算得到，其中ηr为相对粘度(t溶液/t溶剂)，C为溶液浓度。
所述液晶聚酯组合物的高温耐热稳定性的测试方法：将液晶聚酯组合物在120℃干燥4小时后，加入HAAKE Polylab OS型密炼仪进行密炼，密炼温度比液晶聚酯组合物的熔点高20℃，转子的转速为50rpm，密炼时间为1小时；密炼完成后，将熔融的液晶聚酯组合物从密炼机内取出，并冷却到室温；同一样品在密炼前与密炼后均取样进行熔融粘度和比容对数粘度的测试，并进行比较分析；由于密炼是在液晶聚酯组合物熔融温度之上进行，此时将有热分解反应发生；且密炼仪转子的旋转对聚合物熔体的分子链有剪切作用，通常会伴随分子量的降低。因此比较密炼前后熔融粘度和比容对数粘度的变化，可以较直观的反映液晶聚酯组合物在高温下的高温耐热稳定性，熔融粘度和比容对数粘度降低值较小，代表高温耐热稳定性较好。通常，组合物中所包含的填充剂(如玻璃纤维、滑石等)对液晶聚酯组合物的耐热性并无影响，在高温下聚合物会发生热分解使分子链断裂，分子量下降。液晶聚酯组合物中加入含铬化合物使液晶聚酯组合物耐热性提高的机理尚不完全清楚，可能是金属离子与大分子形成络合物，使结构更加稳定；亦有可能是金属离子对分子链增长起到了催化作用，在高温下分子链增长速率与分子链断裂速率相近，使得大分子结构整体保持稳定。
本发明中使用的液晶聚酯含有的重复单元对应的单体的名称和缩写分别如下：
4-羟基苯甲酸(HBA)；
4,4’-二羟基联苯(BP)；
对苯二甲酸(TA)；
间苯二甲酸(IA)；
2-羟基-6-萘甲酸(HNA)；
对苯二酚(HQ)；
2,6-萘二甲酸(NDA)；
本发明中使用的含铬化合物：
碳化铬：西格玛-奥德里奇(上海)贸易有限公司；
乙酸铬：西格玛-奥德里奇(上海)贸易有限公司；
乙酰丙酮铬：西格玛-奥德里奇(上海)贸易有限公司；
(苯甲酸乙酯)三羰基铬：西格玛-奥德里奇(上海)贸易有限公司；
本发明中使用的含钡化合物：
乙酸钡：西格玛-奥德里奇(上海)贸易有限公司；
本发明中使用的含锡化合物：
氧化锡(IV)：西格玛-奥德里奇(上海)贸易有限公司；
本发明中使用的玻璃纤维：牌号CS03JAPX-1，数均纤维直径10微米，数均长径比300，数均纤维长度3000微米，Asahi Fiber Glass Co.,Ltd。
实施例A1-A4:液晶聚酯的制备
在装配有搅拌器、温度计、氮气导入管和回流冷凝装置的反应釜中按照配比分别加入衍生自芳香族羟基羧酸的重复单元、衍生自芳香族二醇的重复单元和衍生自芳香族二羧酸的重复单元，并加入一定比例的醋酸酐为酰化剂；然后将氮气通入反应釜中进行置换；开动搅拌，在氮气流中将反应混合物由室温加热到140℃-160℃，在此温度下回流1小时-3小时；此后继续升温，将混合物经2小时-4小时从140℃-160℃加热到300℃-350℃，在此过程中蒸出未反应的醋酸酐和副反应产物醋酸；终缩聚阶段，对反应体系进行减压，并通过观察扭矩升高作为反应结束的终点判断；此时将熔体状态的预聚物经放料口排出，并冷却至室温；进一步将预聚物转移至固相聚合装置，经5小时-7小时将温度由室温升高至260℃-280℃，在此温度下保温9小时-11小时进行固相聚合反应；反应结束后将产物导出，从而得到液晶聚酯。
表1 实施例A1-A4的具体配比及其测试性能结果
Figure PCTCN2017080252-appb-000001
实施例1-17及对比例1-6：液晶聚酯组合物的制备
按表2的配比将由实施例A1-A4制备所得液晶聚酯、填充剂、含铬化合物和/或含钡化合物和/或含锡化合物、和/或各种添加剂用高速混合机混合均匀后，加入双螺杆挤出机，在280RPM-320RPM的螺杆转速下熔融混合，螺筒温度为290℃-355℃，挤出，冷却、切粒，即得液晶聚酯组合物。所得液晶聚酯组合物的熔点、熔融粘度和比容对数粘度列于表2中；
其中，液晶聚酯组合物中的金属铬元素、金属钡元素、金属锡元素含量是在液晶聚酯组合物的制备过程中通过含铬化合物、含钡化合物、含锡化合物的实际添加量来进行调整并测得的。
表2
Figure PCTCN2017080252-appb-000002
Figure PCTCN2017080252-appb-000003
续表2
Figure PCTCN2017080252-appb-000004
续表2
Figure PCTCN2017080252-appb-000005
Figure PCTCN2017080252-appb-000006
从表2的实施例1-17及对比例1-6的比较可以看出，本发明通过选用在液晶聚酯组合物配方中添加金属铬元素的重量含量基于液晶聚酯组合物的总重量为0.1ppm-500ppm时，得到的液晶聚酯组合物的高温耐热稳定性得到意想不到的显著改善。

Claims (15)

  1. 一种液晶聚酯组合物，其特征在于，基于液晶聚酯组合物的总重量，金属铬元素的重量含量为0.1ppm-500ppm。
  2. 根据权利要求1所述的液晶聚酯组合物，其特征在于，金属铬元素的重量含量的测试方法：将液晶聚酯组合物在120℃干燥4小时，取1g待处理样品，加入硝酸和双氧水，加热2小时，期间不断加入硝酸和双氧水；样品的消解完成后，取消解后的试样，采用Agilent公司型号为720ES的全自动电感耦合等离子体原子发射光谱仪分析样品中金属铬元素的重量含量。
  3. 根据权利要求1所述的液晶聚酯组合物，其特征在于，基于液晶聚酯组合物的总重量，金属铬元素的重量含量优选为0.5ppm-300ppm，更优选为1ppm-100ppm。
  4. 根据权利要求1所述的液晶聚酯组合物，其特征在于，还包括金属钡元素，基于液晶聚酯组合物的总重量，金属钡元素的重量含量为0.1ppm-500ppm，优选为1ppm-200ppm。
  5. 根据权利要求4所述的液晶聚酯组合物，其特征在于，金属钡元素的重量含量的测试方法：将液晶聚酯组合物在120℃干燥4小时，取1g待处理样品，加入硝酸和双氧水，加热2小时，期间不断加入硝酸和双氧水；样品的消解完成后，取消解后的试样，采用Agilent公司型号为720ES的全自动电感耦合等离子体原子发射光谱仪分析样品中金属钡元素的重量含量。
  6. 根据权利要求1所述的液晶聚酯组合物，其特征在于，还包括金属锡元素，基于液晶聚酯组合物的总重量，金属锡元素的重量含量为0.1ppm-500ppm，优选为1ppm-200ppm。
  7. 根据权利要求6所述的液晶聚酯组合物，其特征在于，金属锡元素的重量含量的测试方法：将液晶聚酯组合物在120℃干燥4小时，取1g待处理样品，加入硝酸和双氧水，加热2小时，期间不断加入硝酸和双氧水；样品的消解完成后，取消解后的试样，采用Agilent公司型号为720ES的全自动电感耦合等离子体原子发射光谱仪分析样品中金属锡元素的重量含量。
  8. 根据权利要求1-7任一项所述的液晶聚酯组合物，其特征在于，所述液晶聚酯组合物，按重量份计，包括如下组分：
    液晶聚酯              100份；
    填充剂                5份-100份。
  9. 根据权利要求8所述的液晶聚酯组合物，其特征在于，所述液晶聚酯组合物的熔点为150℃-400℃；所述熔点的测试方法为：通过NETZSCH公司DSC200F3型差示扫描量热仪DSC，在从室温开始以20℃/分钟的升温条件测试，观测到吸热峰温度Tm1后，在比Tm1高20℃的温度下保持5分钟，然后在20℃/分钟的降温条件下冷却至室温，然后再次以20℃/分钟的升温条件进行测定，此时观测到的吸热峰温度Tm2即为液晶聚酯组合物的熔点。
  10. 根据权利要求8所述的液晶聚酯组合物，其特征在于，所述液晶聚酯，按摩尔百分比计，包含如下重复单元：
    衍生自芳香族羟基羧酸的重复单元              30mol％-100mol％；
    衍生自芳香族二醇的重复单元                  0mol％-35mol％；
    衍生自芳香族二羧酸的重复单元                0mol％-35mol％。
  11. 根据权利要求10所述的液晶聚酯组合物，其特征在于，所述液晶聚酯，按摩尔百分比计，包括如下重复单元：
    衍生自芳香族羟基羧酸的重复单元              50mol％-100mol％；
    衍生自芳香族二醇的重复单元                  0mol％-25mol％；
    衍生自芳香族二羧酸的重复单元                0mol％-25mol％。
  12. 根据权利要求10或11所述的液晶聚酯组合物，其特征在于，所述衍生自芳香族羟基羧酸的重复单元选自衍生自4-羟基苯甲酸的重复单元和/或2-羟基-6-萘甲酸的重复单元；所述衍生自芳香族二醇的重复单元选自对苯二酚的重复单元和/或4,4’-二羟基联苯的重复单元；所述衍生自芳香族二羧酸的重复单元选自对苯二甲酸的重复单元、间苯二甲酸的重复单元、2,6-萘二甲酸的重复单元中一种或几种。
  13. 根据权利要求8所述的液晶聚酯组合物，其特征在于，所述填充剂选自纤维状填充剂和/或板状填充剂；所述纤维状填充剂选自玻璃纤维、石棉纤维、二氧化硅纤维、二氧化硅-氧化铝纤维、钛酸钾纤维、碳或石墨纤维、金属纤维中的一种或几种；优选为玻璃纤维；所述板状填充剂选自滑石、云母、石墨、高岭土中的一种或几种；优选为云母。
  14. 根据权利要求13所述的液晶聚酯组合物，其特征在于，所述玻璃纤维的数均纤维直径为3微米-30微米，数均长径比大于等于5，数均纤维长度为50 微米-3000微米；所述云母的平均粒径为0.5微米-200微米。
  15. 根据权利要求8所述的液晶聚酯组合物，其特征在于，还包含各种添加剂；所述各种添加剂选自增塑剂、稳定剂、着色剂、润滑剂、脱模剂、抗氧剂中的一种或几种。
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