WO2017088692A1 - 一种玻纤增强阻燃pbt组合物及其制备方法 - Google Patents

一种玻纤增强阻燃pbt组合物及其制备方法 Download PDF

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WO2017088692A1
WO2017088692A1 PCT/CN2016/106105 CN2016106105W WO2017088692A1 WO 2017088692 A1 WO2017088692 A1 WO 2017088692A1 CN 2016106105 W CN2016106105 W CN 2016106105W WO 2017088692 A1 WO2017088692 A1 WO 2017088692A1
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glass fiber
parts
fiber reinforced
ppm
flame retardant
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陈锐
朱文
陈伟
陈锋
付学俊
孙东海
叶南飚
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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
    • 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
    • C08L67/02—Polyesters derived from dicarboxylic acids and dihydroxy compounds
    • C—CHEMISTRY; METALLURGY
    • C08—ORGANIC MACROMOLECULAR COMPOUNDS; THEIR PREPARATION OR CHEMICAL WORKING-UP; COMPOSITIONS BASED THEREON
    • C08J—WORKING-UP; GENERAL PROCESSES OF COMPOUNDING; AFTER-TREATMENT NOT COVERED BY SUBCLASSES C08B, C08C, C08F, C08G or C08H
    • C08J5/00—Manufacture of articles or shaped materials containing macromolecular substances
    • C08J5/04—Reinforcing macromolecular compounds with loose or coherent fibrous material
    • C08J5/0405—Reinforcing macromolecular compounds with loose or coherent fibrous material with inorganic fibres
    • C08J5/043—Reinforcing macromolecular compounds with loose or coherent fibrous material with inorganic fibres with glass fibres
    • C—CHEMISTRY; METALLURGY
    • C08—ORGANIC MACROMOLECULAR COMPOUNDS; THEIR PREPARATION OR CHEMICAL WORKING-UP; COMPOSITIONS BASED THEREON
    • C08J—WORKING-UP; GENERAL PROCESSES OF COMPOUNDING; AFTER-TREATMENT NOT COVERED BY SUBCLASSES C08B, C08C, C08F, C08G or C08H
    • C08J2367/00—Characterised by the use of polyesters obtained by reactions forming a carboxylic ester link in the main chain; Derivatives of such polymers
    • C08J2367/02—Polyesters derived from dicarboxylic acids and dihydroxy compounds
    • C—CHEMISTRY; METALLURGY
    • C08—ORGANIC MACROMOLECULAR COMPOUNDS; THEIR PREPARATION OR CHEMICAL WORKING-UP; COMPOSITIONS BASED THEREON
    • C08J—WORKING-UP; GENERAL PROCESSES OF COMPOUNDING; AFTER-TREATMENT NOT COVERED BY SUBCLASSES C08B, C08C, C08F, C08G or C08H
    • C08J2425/00—Characterised by the use of homopolymers or copolymers of compounds having one or more unsaturated aliphatic radicals, each having only one carbon-to-carbon double bond, and at least one being terminated by an aromatic carbocyclic ring; Derivatives of such polymers
    • C08J2425/18—Homopolymers or copolymers of aromatic monomers containing elements other than carbon and hydrogen
    • C—CHEMISTRY; METALLURGY
    • C08—ORGANIC MACROMOLECULAR COMPOUNDS; THEIR PREPARATION OR CHEMICAL WORKING-UP; COMPOSITIONS BASED THEREON
    • C08J—WORKING-UP; GENERAL PROCESSES OF COMPOUNDING; AFTER-TREATMENT NOT COVERED BY SUBCLASSES C08B, C08C, C08F, C08G or C08H
    • C08J2463/00—Characterised by the use of epoxy resins; Derivatives of epoxy resins
    • C—CHEMISTRY; METALLURGY
    • C08—ORGANIC MACROMOLECULAR COMPOUNDS; THEIR PREPARATION OR CHEMICAL WORKING-UP; COMPOSITIONS BASED THEREON
    • C08J—WORKING-UP; GENERAL PROCESSES OF COMPOUNDING; AFTER-TREATMENT NOT COVERED BY SUBCLASSES C08B, C08C, C08F, C08G or C08H
    • C08J3/00—Processes of treating or compounding macromolecular substances
    • C08J3/20—Compounding polymers with additives, e.g. colouring
    • C08J3/205—Compounding polymers with additives, e.g. colouring in the presence of a continuous liquid phase
    • C08J3/21—Compounding polymers with additives, e.g. colouring in the presence of a continuous liquid phase the polymer being premixed with a liquid phase
    • C08J3/215—Compounding polymers with additives, e.g. colouring in the presence of a continuous liquid phase the polymer being premixed with a liquid phase at least one additive being also premixed with a liquid phase
    • C—CHEMISTRY; METALLURGY
    • C08—ORGANIC MACROMOLECULAR COMPOUNDS; THEIR PREPARATION OR CHEMICAL WORKING-UP; COMPOSITIONS BASED THEREON
    • C08K—Use of inorganic or non-macromolecular organic substances as compounding ingredients
    • C08K3/00—Use of inorganic substances as compounding ingredients
    • C08K3/18—Oxygen-containing compounds, e.g. metal carbonyls
    • C08K3/20—Oxides; Hydroxides
    • C08K3/22—Oxides; Hydroxides of metals
    • C08K3/2279—Oxides; Hydroxides of metals of antimony
    • C—CHEMISTRY; METALLURGY
    • C08—ORGANIC MACROMOLECULAR COMPOUNDS; THEIR PREPARATION OR CHEMICAL WORKING-UP; COMPOSITIONS BASED THEREON
    • C08L—COMPOSITIONS OF MACROMOLECULAR COMPOUNDS
    • C08L2201/00—Properties
    • C08L2201/02—Flame or fire retardant/resistant
    • C—CHEMISTRY; METALLURGY
    • C08—ORGANIC MACROMOLECULAR COMPOUNDS; THEIR PREPARATION OR CHEMICAL WORKING-UP; COMPOSITIONS BASED THEREON
    • C08L—COMPOSITIONS OF MACROMOLECULAR COMPOUNDS
    • C08L2205/00—Polymer mixtures characterised by other features
    • C08L2205/08—Polymer mixtures characterised by other features containing additives to improve the compatibility between two polymers
    • C—CHEMISTRY; METALLURGY
    • C08—ORGANIC MACROMOLECULAR COMPOUNDS; THEIR PREPARATION OR CHEMICAL WORKING-UP; COMPOSITIONS BASED THEREON
    • C08L—COMPOSITIONS OF MACROMOLECULAR COMPOUNDS
    • C08L25/00—Compositions of, homopolymers or copolymers of compounds having one or more unsaturated aliphatic radicals, each having only one carbon-to-carbon double bond, and at least one being terminated by an aromatic carbocyclic ring; Compositions of derivatives of such polymers
    • C08L25/18—Homopolymers or copolymers of aromatic monomers containing elements other than carbon and hydrogen

Definitions

  • the present invention relates to a PBT composition, and more particularly to a glass fiber reinforced flame-retardant PBT composition having excellent fluidity and good injection molding appearance and a preparation method thereof.
  • PBT Polybutylene terephthalate
  • the inventors have surprisingly found through a large number of experiments that the content of tetrahydrofuran added to the glass fiber reinforced flame retardant PBT composition is more than 500 ppm and 10 ppm or more based on the total weight of the glass fiber reinforced flame retardant PBT composition. Improve the fluidity and injection molding appearance of glass fiber reinforced flame retardant PBT compositions.
  • Another object of the present invention is to provide a process for the preparation of the above glass fiber reinforced flame retardant PBT composition.
  • a glass fiber reinforced flame retardant PBT composition in parts by weight, comprising the following components:
  • a glass fiber reinforced flame retardant PBT composition in parts by weight, comprises the following components:
  • the content of tetrahydrofuran is 500 ppm or less and 10 ppm or more based on the total weight of the glass fiber reinforced flame-retardant PBT composition.
  • the content of tetrahydrofuran is determined by headspace gas chromatography: after a certain amount of the sample is placed in a liquid nitrogen biological container for 5 minutes, it is taken out, crushed, sieved, and a product of 30-40 mesh is taken, and a certain amount of the sample is weighed;
  • the Agilent 7890A gas chromatograph was used to produce DB-WAX gas chromatograph column from Agilent. It was injected by Agilent's 7697 headspace sampler; the headspace injection condition was 100 °C, constant temperature 4 The injection was carried out after an hour; the working curve was calibrated with tetrahydrofuran/methanol solution.
  • the content of tetrahydrofuran is 400 ppm or more and 20 ppm or more based on the total weight of the glass fiber reinforced flame-retardant PBT composition; more preferably 300 ppm or more and 30 ppm or more.
  • the PBT resin has an intrinsic viscosity of 0.5 dl/g to 1.5 dl/g and a density of 1.30 g/cm 3 to 1.33 g/cm 3 .
  • the flame retardant is a mixture of a halogen flame retardant and a flame retardant synergist;
  • the halogen flame retardant is selected from the group consisting of a brominated epoxy resin, a brominated polystyrene, and decabromodiphenylethane.
  • the flame retardant synergist is selected from one or more of antimony trioxide, antimony pentoxide, and sodium antimonate.
  • the glass fiber has a diameter of 5 ⁇ m to 15 ⁇ m.
  • the glass fiber reinforced flame retardant PBT composition may further comprise 0-2 parts of an auxiliary agent selected from one or more of an antioxidant, a light stabilizer, a lubricant, a toughening agent, and a nucleating agent. .
  • Suitable antioxidants can enhance the heat aging resistance of the material during processing and use, and can generally be selected from one or more of a combination of phenols, phosphites, thioesters.
  • a suitable light stabilizer can improve the photoaging resistance of the material during use, and can be compounded by one or more of hindered amines, benzotriazoles, and benzoxazinone complexes.
  • Suitable lubricants are one or more of low molecular ester stearic acid, metal soap (Cast, Znst), stearic acid complex ester or amide (erucamide).
  • a suitable nucleating agent is a long-chain linear saturated carboxylic acid sodium salt. Compared with traditional nucleating agents (such as talc), it can not only improve the crystallinity of the material, but also generate some small spherical crystals, which makes the mechanical properties of PBT resin. optimize.
  • Suitable toughening agents are ethylene-butyl methacrylate-glycidyl acrylate terpolymer, ethylene-methyl acrylate binary copolymer and the like.
  • the preparation method of the above glass fiber reinforced flame retardant PBT composition comprises the following steps:
  • the premix is passed through a twin-screw extruder at 220 ° C-240. Melt extrusion at °C, glass fiber side feeding, cooling, granulation to obtain a glass fiber reinforced flame retardant PBT composition.
  • the invention has the following beneficial effects:
  • the invention can significantly improve the glass fiber reinforced flame retardant PBT by selecting the content of tetrahydrofuran in the glass fiber reinforced flame retardant PBT composition based on the total weight of the glass fiber reinforced flame retardant PBT composition of 500 ppm or more and 10 ppm or more.
  • the fluidity of the composition and the appearance of the injection molding can significantly improve the glass fiber reinforced flame retardant PBT by selecting the content of tetrahydrofuran in the glass fiber reinforced flame retardant PBT composition based on the total weight of the glass fiber reinforced flame retardant PBT composition of 500 ppm or more and 10 ppm or more.
  • the test method for the content of tetrahydrofuran is headspace gas chromatography: after a certain amount of sample is placed in a liquid nitrogen biological container for 5 minutes, it is taken out, crushed, sieved, and a product of 30-40 mesh is taken, and a certain amount of sample is weighed; Agilent's Model 7890A gas chromatograph is a DB-WAX GC column produced by Agilent. It is sampled by Agilent's Model 7697 Headspace Sampler. The headspace injection conditions are 100 °C and the temperature is 4 hours. Post injection; working curve was calibrated with tetrahydrofuran/methanol solution.
  • Cantilever beam notched impact strength test standard ISO180-2000;
  • Spiral length use the internal mold of the blonde, the spiral section size is 5mm*2.5mm, with constant Injection molding pressure (50% pressure) and speed (50% speed) are injected to observe the maximum length that the spiral can be injection molded;
  • Embodiments of the invention employ the following materials, but are not limited to these materials:
  • PBT resin Blonde Technology Co., Ltd., grade PBT-1, intrinsic viscosity 1.0dl/g, density 1.31g/cm 3 ;
  • halogen flame retardant brominated epoxy resin, Korea Yujin brand CXB-2000H;
  • Glass fiber Jushi Group, diameter 10 ⁇ m, ER-13;
  • Antioxidant 1010 Ciba, Switzerland, grade Irganox 1010;
  • the tetrahydrofuran and the methyl siloxane are formulated into a tetrahydrofuran methyl siloxane solution having a mass fraction of 20 ppm to 1000 ppm; the tetrahydrofuran methyl siloxane solution is a PBT resin, a flame retardant and an auxiliary agent according to the ratio of Table 1
  • the premix is obtained by mixing in a high-speed mixer for 1 minute to 2 minutes.
  • the premix is melt-extruded at 220 °C-240 °C through a twin-screw extruder, and the glass fiber side is fed, cooled and granulated to obtain a glass fiber reinforced flame retardant.
  • PBT composition wherein the temperature of each barrel of the twin-screw extruder (from the feeding port to the head) are: 140 ° C, 220 ° C, 230 ° C, 240 ° C, 240 ° C, 220 ° C, and the screw speed is 300 rpm.
  • the feeding amount is 50kg/h.
  • the present invention selects the content of tetrahydrofuran in the glass fiber reinforced flame retardant PBT composition formulation based on the total weight of the glass fiber reinforced flame retardant PBT composition.
  • the medium is less than or equal to 500 ppm and greater than or equal to 10 ppm
  • the fluidity and injection molding appearance of the glass fiber reinforced flame-retardant PBT composition can be remarkably improved.
  • tetrahydrofuran is less than 10 ppm, the fluidity is poor, as in Comparative Examples 1, 3, 5, and 8; when tetrahydrofuran is more than 500 ppm, although the fluidity is good, the appearance is poor, as in Comparative Examples 2, 4, 6, 7, 9.

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  • Chemical Kinetics & Catalysis (AREA)
  • Medicinal Chemistry (AREA)
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  • Engineering & Computer Science (AREA)
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Abstract

本发明公开了一种玻纤增强阻燃PBT组合物，按重量份数计，包括如下组分： PBT树脂 35份-71份；阻燃剂 5份-30份；玻璃纤维 5份-50份；基于玻纤增强阻燃PBT组合物的总重量中，四氢呋喃的含量小于等于500ppm和大于等于10ppm。本发明通过选用在玻纤增强阻燃PBT组合物配方中添加四氢呋喃的含量基于玻纤增强阻燃PBT组合物的总重量中小于等于500ppm和大于等于10ppm时，能够明显改善玻纤增强阻燃PBT组合物的流动性和注塑外观。

Description

一种玻纤增强阻燃PBT组合物及其制备方法 技术领域
本发明涉及一种PBT组合物，特别涉及一种具有优异流动性和良好注塑外观的玻纤增强阻燃PBT组合物及其制备方法。
背景技术
聚对苯二甲酸丁二醇酯(PBT)是一种半结晶性的工程塑料，具有良好的力学性能、电性能、耐热性及耐化学性等，广泛用于汽车、电子、电器等行业。但是PBT尚存在不足之处，如PBT注塑件的流动性以及注塑外观品质很差，从而限制了其在上述行业中的应用。
在不影响PBT材料的力学和加工性能的前提下，使注塑制件能满足流动性和外观品质得到改善的要求一直是业界难点问题。
到目前为止，关于四氢呋喃的含量对PBT组合物的流动性和注塑外观的影响未见报道。
本发明人经过大量实验惊讶地发现，选用在玻纤增强阻燃PBT组合物配方中添加四氢呋喃的含量基于玻纤增强阻燃PBT组合物的总重量中小于等于500ppm和大于等于10ppm时，能够明显改善玻纤增强阻燃PBT组合物的流动性和注塑外观。
发明内容
为了克服现有技术的缺点与不足，本发明的首要目的是提供一种具有优异的流动性和良好注塑外观的玻纤增强阻燃PBT组合物。
本发明的另一目的在于提供上述玻纤增强阻燃PBT组合物的制备方法。
本发明上述目的通过如下技术方案予以实现：
一种玻纤增强阻燃PBT组合物，按重量份数计，包括如下组分：
PBT树脂                  35份-71份；
阻燃剂                   5份-30份；
玻璃纤维                 5份-50份。
优选地，一种玻纤增强阻燃PBT组合物，按重量份数计，包括如下组分：
PBT树脂                  40份-57份；
阻燃剂                   9份-23份；
玻璃纤维                 10份-40份；
基于玻纤增强阻燃PBT组合物的总重量中，四氢呋喃的含量小于等于500ppm和大于等于10ppm。
其中，四氢呋喃的含量采用顶空气相色谱法测定：将一定量的试样置于液氮生物容器中5min后，取出粉碎，过筛，取30-40目的产物，称取一定量的试样；采用安捷伦公司生产的7890A型气相色谱仪，色谱柱为安捷伦公司生产DB-WAX型气相色谱柱，采用安捷伦公司生产7697型顶空进样器进样；顶空进样条件为100℃，恒温4小时后进样；工作曲线由四氢呋喃/甲醇溶液标定。
当基于玻纤增强阻燃PBT组合物的总重量中，四氢呋喃的含量超过500ppm，会造成表面外观不良。
优选地，基于玻纤增强阻燃PBT组合物的总重量中，四氢呋喃的含量小于等于400ppm和大于等于20ppm；更优选为小于等于300ppm和大于等于30ppm。
其中，所述PBT树脂的特性粘度为0.5dl/g-1.5dl/g，密度为1.30g/cm3-1.33g/cm3。
其中，所述阻燃剂为卤素阻燃剂与阻燃协效剂的混合；所述卤素阻燃剂选自溴化环氧树脂、溴化聚苯乙烯、十溴二苯乙烷中的一种或几种；所述阻燃协效剂选自三氧化二锑、五氧化二锑、锑酸钠中的一种或几种。
其中，所述玻璃纤维的直径为5μm-15μm。
上述玻纤增强阻燃PBT组合物还可以包括0-2份助剂，所述助剂选自抗氧剂、光稳定剂、润滑剂、增韧剂、成核剂中的一种或几种。
合适的抗氧剂可以提高材料在加工和使用过程中的耐热老化性能，通常可选自酚类、亚磷酸酯类、硫代酯类的复合物中的一种或几种复配。
合适的光稳定剂可以提高材料在使用过程中的耐光老化性能，可为受阻胺类、苯并三唑类、苯并噁嗪酮类复合物中的一种或几种复配。
合适的润滑剂为低分子酯类硬脂酸、金属皂(Cast、Znst)、硬脂酸复合酯或酰胺类(芥酸酰胺)中的一种或几种复配。
合适的成核剂为长链线性饱和羧酸钠盐，因其与传统成核剂(如滑石粉)相比，不仅能提高材料的结晶度还能生成一些小球晶体，使得PBT树脂力学性能最优化。
合适的增韧剂为乙烯-甲基丙烯酸丁酯-丙烯酸缩水甘油酯三元共聚物，乙烯-丙烯酸甲酯二元共聚物等。
上述玻纤增强阻燃PBT组合物的制备方法，包括如下步骤：
a)将四氢呋喃与甲基硅氧烷配成质量分数为20ppm-1000ppm的四氢呋喃甲基硅氧烷溶液；
b)将四氢呋喃甲基硅氧烷溶液与PBT树脂、阻燃剂以及助剂在高速混合机中混合1分钟-2分钟得到预混料，预混料经双螺杆挤出机在220℃-240℃下熔融挤出、玻璃纤维侧喂，冷却、造粒得到玻纤增强阻燃PBT组合物。
本发明与现有技术相比，具有如下有益效果：
本发明通过选用在玻纤增强阻燃PBT组合物配方中添加四氢呋喃的含量基于玻纤增强阻燃PBT组合物的总重量中小于等于500ppm和大于等于10ppm时，能够明显改善玻纤增强阻燃PBT组合物的流动性和注塑外观。
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。
各性能指标的测试方法：
四氢呋喃的含量测试方法为顶空气相色谱法：将一定量的试样置于液氮生物容器中5min后，取出粉碎，过筛，取30-40目的产物，称取一定量的试样；采用安捷伦公司生产的7890A型气相色谱仪，色谱柱为安捷伦公司生产DB-WAX型气相色谱柱，采用安捷伦公司生产7697型顶空进样器进样；顶空进样条件为100℃，恒温4小时后进样；工作曲线由四氢呋喃/甲醇溶液标定。
拉伸强度：测试标准ISO527/2-93；
悬臂梁缺口冲击强度：测试标准ISO180-2000；
螺旋线长度：使用金发内部模具，螺旋线截面尺寸5mm*2.5mm，用恒定的 注塑压力(50％压力)和速度(50％速度)进行注塑，观察螺旋线可以注塑出的最大长度；
注塑件外观：注塑100mm*100mm*2mm的方板，目测方板上的水花，水花总数目0～2定义为“优”，水花总数目3～4定义为“良”，水花总数目5～6定义为“中”，水花总数目大于6定义为“差”；
本发明的实施例采用如下原料，但不仅限于这些原料：
PBT树脂，金发科技股份有限公司，牌号PBT-1，特性粘度1.0dl/g，密度1.31g/cm3；
阻燃剂：卤素阻燃剂：溴化环氧树脂，韩国宇进 牌号CXB-2000H；
                    溴化聚苯乙烯，美国雅宝 牌号SAYTEX 621；
        阻燃协效剂：三氧化二锑，上海涵丰化工；
玻璃纤维：巨石集团，直径为10μm，ER-13；
四氢呋喃：济南源茂化工有限公司；
助剂：抗氧剂1010，瑞士Ciba公司，牌号Irganox 1010；
      OP蜡，上海嘉卓化工。
实施例1-9及对比例1-9：玻纤增强阻燃PBT组合物的制备
将四氢呋喃与甲基硅氧烷配成质量分数为20ppm-1000ppm的四氢呋喃甲基硅氧烷溶液；将四氢呋喃甲基硅氧烷溶液按表1的配比将PBT树脂、阻燃剂以及助剂在高速混合机中混合1分钟-2分钟得到预混料，预混料经双螺杆挤出机在220℃-240℃下熔融挤出、玻璃纤维侧喂，冷却、造粒得到玻纤增强阻燃PBT组合物；其中双螺杆挤出机各螺筒温度(由加料口到机头)分别是：140℃、220℃、230℃、240℃、240℃、220℃，螺杆转速为300转/分钟，喂料量50kg/h。
表1 实施例1-9及对比例1-9的各组分配比(重量份)及各性能测试结果
Figure PCTCN2016106105-appb-000001
续表1
Figure PCTCN2016106105-appb-000002
从表1的实施例1-9及对比例1-9的比较可知，本发明通过选用在玻纤增强阻燃PBT组合物配方中添加四氢呋喃的含量基于玻纤增强阻燃PBT组合物的总重量中小于等于500ppm和大于等于10ppm时，能够明显改善玻纤增强阻燃PBT组合物的流动性和注塑外观。当四氢呋喃小于10ppm时，流动性差，如对比例1，3，5，8；当四氢呋喃大于500ppm时，虽然流动性好但是外观差，如对比例2，4，6，7，9。

Claims (8)

  1. 一种玻纤增强阻燃PBT组合物，按重量份数计，包括如下组分：
    PBT树脂           35份-71份；
    阻燃剂            5份-30份；
    玻璃纤维          5份-50份。
  2. 根据权利要求1所述的玻纤增强阻燃PBT组合物，其特征在于，按重量份数计，包括如下组分：
    PBT树脂           40份-57份；
    阻燃剂            9份-23份；
    玻璃纤维          10份-40份；
    基于玻纤增强阻燃PBT组合物的总重量中，四氢呋喃的含量小于等于500ppm和大于等于10ppm；
    其中，四氢呋喃的含量采用顶空气相色谱法测定：将一定量的试样置于液氮生物容器中5min后，取出粉碎，过筛，取30-40目的产物，称取一定量的试样；采用安捷伦公司生产的7890A型气相色谱仪，色谱柱为安捷伦公司生产DB-WAX型气相色谱柱，采用安捷伦公司生产7697型顶空进样器进样；顶空进样条件为100℃，恒温4小时后进样；工作曲线由四氢呋喃/甲醇溶液标定。
  3. 根据权利要求2所述的玻纤增强阻燃PBT组合物，其特征在于，基于玻纤增强阻燃PBT组合物的总重量中，四氢呋喃的含量小于等于400ppm和大于等于20ppm；优选为小于等于300ppm和大于等于30ppm。
  4. 根据权利要求1或2所述的玻纤增强阻燃PBT组合物，其特征在于，所述PBT树脂的特性粘度为0.5dl/g-1.5dl/g，密度为1.30g/cm3-1.33g/cm3。
  5. 根据权利要求1或2所述的玻纤增强阻燃PBT组合物，其特征在于，所述阻燃剂为卤素阻燃剂与阻燃协效剂的混合；所述卤素阻燃剂选自溴化环氧树脂、溴化聚苯乙烯、十溴二苯乙烷中的一种或几种；所述阻燃协效剂选自三氧化二锑、五氧化二锑、锑酸钠中的一种或几种。
  6. 根据权利要求1或2所述的玻纤增强阻燃PBT组合物，其特征在于，所述玻璃纤维为直径为5μm-15μm。
  7. 根据权利要求1或2所述的玻纤增强阻燃PBT组合物，其特征在于，还包括0-2份助剂，所述助剂选自抗氧剂、光稳定剂、润滑剂、增韧剂、成核剂中的一种或几种。
  8. 一种如权利要求1-7中任一项所述的玻纤增强阻燃PBT组合物的制备方法，其特征在于：包括如下步骤：
    a)将四氢呋喃与甲基硅氧烷配成质量分数为20ppm-1000ppm的四氢呋喃甲基硅氧烷溶液；
    b)将四氢呋喃甲基硅氧烷溶液与PBT树脂、阻燃剂以及助剂在高速混合机中混合1分钟-2分钟得到预混料，预混料经双螺杆挤出机在220℃-240℃下熔融挤出、玻璃纤维侧喂，冷却、造粒得到玻纤增强阻燃PBT组合物。
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