WO2006001475A1 - 難燃性ポリブチレンテレフタレート組成物および成形体 - Google Patents
難燃性ポリブチレンテレフタレート組成物および成形体 Download PDFInfo
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- WO2006001475A1 WO2006001475A1 PCT/JP2005/011936 JP2005011936W WO2006001475A1 WO 2006001475 A1 WO2006001475 A1 WO 2006001475A1 JP 2005011936 W JP2005011936 W JP 2005011936W WO 2006001475 A1 WO2006001475 A1 WO 2006001475A1
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- C—CHEMISTRY; METALLURGY
- C08—ORGANIC MACROMOLECULAR COMPOUNDS; THEIR PREPARATION OR CHEMICAL WORKING-UP; COMPOSITIONS BASED THEREON
- C08K—Use of inorganic or non-macromolecular organic substances as compounding ingredients
- C08K5/00—Use of organic ingredients
- C08K5/16—Nitrogen-containing compounds
- C08K5/34—Heterocyclic compounds having nitrogen in the ring
- C08K5/3467—Heterocyclic compounds having nitrogen in the ring having more than two nitrogen atoms in the ring
- C08K5/3477—Six-membered rings
- C08K5/3492—Triazines
- C08K5/34928—Salts
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- 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
- C08K5/49—Phosphorus-containing compounds
- C08K5/5399—Phosphorus bound to nitrogen
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- 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
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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
- C08L101/00—Compositions of unspecified macromolecular compounds
- C08L101/02—Compositions of unspecified macromolecular compounds characterised by the presence of specified groups, e.g. terminal or pendant functional groups
- C08L101/04—Compositions of unspecified macromolecular compounds characterised by the presence of specified groups, e.g. terminal or pendant functional groups containing halogen atoms
Definitions
- the present invention relates to a flame retardant polybutylene terephthalate composition, and more specifically, suitable for electrical and electronic parts such as connectors and relay parts having high flame retardancy and high stability against hydrolysis.
- the present invention relates to a flame retardant polybutylene terephthalate composition that can be used, and a molded article comprising the composition.
- Polybutylene terephthalate (sometimes abbreviated as PBT), which is a typical engineering plastic among thermoplastic polyester resin, is easy to mold, mechanical properties, heat resistance, other physical properties, Because of its excellent chemical properties, it is widely used in fields such as automobile parts, electrical and electronic parts, and precision equipment parts.
- PBT has low hygroscopicity, it is essentially not affected by water at room temperature. However, at high temperatures, ester groups are hydrolyzed by water or water vapor to form hydroxyl and carboxyl groups, and carboxyl groups become autocatalysts to further promote hydrolysis, limiting use in wet heat environments. . For this reason, PBT that has high stability against hydrolysis and can be used even in a humid heat environment is desired.
- the terminal carboxyl group is reduced. It is known to decrease (Patent Document 1).
- the terminal carboxyl group concentration is 30 eq Zg or less
- the cooling crystallization temperature is 175 ° C or more
- the cooling crystallization temperature is 175 ° C or more
- the residual tetrahydrofuran amount is 300 ppm.
- Patent Document 2 A flame retardant PBT composition containing a heavy part has been proposed (Patent Document 2). Such a composition has high flame retardancy, has a short molding cycle, is excellent in productivity, and is suitable for electrical and electronic parts such as relay parts that are highly resistant to hydrolysis, especially without corrosion of electrical contacts. It can be used.
- terephthalic acid and 1,4 butanediol are used, preferably a titanium compound is used as the catalyst, and the amount of the catalyst used is ester.
- the drought reaction is 30 to 300 ppm relative to the theoretical yield of PBT and that it is 300 ppm or less in the polycondensation process (Patent Document 2).
- Patent Document 2 the amount of titanium remaining in the PBT and the effect thereof are not mentioned, titanium used as a catalyst remains in the resin almost quantitatively, so it was proposed as Example 1.
- the amount of catalyst used and the amount of titanium in PBT are calculated to be about 194 ppm.
- Patent Document 1 Japanese Patent Laid-Open No. 9316183
- Patent Document 2 Japanese Patent Laid-Open No. 2004-91583
- An object of the present invention is to provide a flame retardant polymer that can be suitably used for electrical and electronic parts such as connectors and relay parts, which have high flame resistance and at the same time have high stability against hydrolysis.
- the object is to provide a butylene terephthalate composition.
- the first gist of the present invention is that 3 to 50 parts by weight of a brominated aromatic compound-based flame retardant and 1 to 30 parts by weight of an acid / antimony compound with respect to 100 parts by weight of polybutylene terephthalate.
- a flame retardant polybutylene terephthalate composition comprising: a titanium content of more than 33 ppm and not more than 90 ppm in terms of atoms, and a terminal carboxyl group concentration higher than ⁇ / z eqZg.
- a flame-retardant polybutylene terephthalate composition comprising a polybutylene terephthalate having a z eqZg or less and an intrinsic viscosity higher than 0.83 dl Zg.
- the second gist of the present invention is that 3 to 50 parts by weight of at least one compound selected from ester or phospho-tolyl phosphate and 1 to 50 parts by weight of melamine cyanurate with respect to 100 parts by weight of polybutylene terephthalate.
- a flame retardant polybutylene terephthalate composition comprising a poly (butylene terephthalate) composition having a titanium content of more than 33 ppm and not more than 9 Oppm in terms of atoms, and a terminal carboxyl group concentration higher than 10 eqZg and 30 eqZg.
- the flame retardant polybutylene terephthalate composition is characterized by using polybutylene terephthalate having an intrinsic viscosity higher than 0.83 dlZg.
- a third aspect of the present invention resides in a molded article comprising the flame retardant polybutylene terephthalate composition.
- a flame retardant polybutylene terephthalate composition suitable for electrical and electronic parts such as connectors and relay parts having high flame retardancy and at the same time high stability against hydrolysis. Provided.
- FIG. 1 is an explanatory diagram of an example of the esterification reaction process employed in the production example of polybutylene terephthalate.
- FIG. 2 is an explanatory diagram of an example of a polycondensation process employed in an example of production of polybutylene terephthalate.
- PBT used in the present invention has a titanium content of more than 33 ppm and 90 ppm or less in terms of atoms, a terminal carboxyl group concentration higher than ⁇ / z eqZg and 30 / z eqZg or lower, and an intrinsic viscosity higher than 0.83 dlZg.
- Titanium in PBT usually has a strength derived from the polymerization catalyst of PBT. If the titanium content is more than 90 ppm, hydrolysis resistance decreases. The reason is not clear, but it is considered that the content of titanium derived from the catalyst is high! The decomposition of PBT at high temperatures is promoted and the hydrolysis resistance is lowered. On the other hand, when the catalyst content is such that the titanium content is 33 ppm or less, not only the polymerization rate is lowered, but also the flame retardancy of the composition using the obtained PBT is lowered. The reason for this is not clear, but when the titanium content is high, the decomposition of PBT at high temperature is promoted and it becomes easy to drip, and the PBT drips down and combustion cannot be continued. PBT is difficult to decompose, does not sag, and continues to burn.
- PBT having a titanium content as defined in the present invention is, for example, terephthalic acid and 1,4 butanediol, and tetrabutyl titanate as a catalyst with respect to the theoretical yield of PBT.
- the oligomer can be obtained by ester reaction under normal pressure at a temperature in the range of 150 to 280 ° C. to obtain an oligomer, followed by polycondensation reaction at 210 to 230 ° C. under reduced pressure.
- the titanium content can be determined by adding the catalytic capacity of the catalyst, or by analyzing the obtained PBT. Specifically, it can be measured by means such as atomic absorption, atomic emission, IC P (inductivery coupled plasma).
- the terminal carboxyl group concentration of PBT used in the present invention is higher than 10 ⁇ eq / g and not higher than 30 ⁇ e qZg.
- the upper limit of the terminal carboxyl group concentration is preferably 25 eqZg, more preferably 20 eq / g.
- the terminal carboxyl group concentration can be determined by dissolving PBT in an organic solvent and titrating with a hydroxide-alkali solution. When the terminal carboxyl group concentration of PBT is 30 eqZg or less, the hydrolysis resistance of the PBT composition can be remarkably improved.
- the carboxyl group in PBT is free from hydrolysis.
- the PBT used in the present invention has an intrinsic viscosity greater than 0.83 dlZg.
- the upper limit of the intrinsic viscosity is usually 1.5 dlZg, preferably 1.3 dlZg, more preferably 1. ldlZg.
- the intrinsic viscosity of PBT exceeds 1.5 dlZg, the melt viscosity of the PBT composition becomes high, the fluidity is deteriorated, and the moldability may be deteriorated.
- the intrinsic viscosity of PBT is a value that can also be obtained as a solution viscosity measured at 30 ° C. using a mixed solvent of phenol Zl, 1, 2, 2-tetrachloroethane (weight ratio 1Z1). is there.
- the method for producing PBT having the above-mentioned properties is not particularly limited, but can be obtained by continuous polymerization using terephthalic acid and 1,4 butanediol as main raw materials.
- the main raw material means that terephthalic acid accounts for 50 mol% or more of all dicarboxylic acid components and 1,4 butanediol accounts for 50 mol% or more of all diol components.
- Terephthalic acid preferably accounts for 80 mol% or more of the total dicarboxylic acid component, more preferably 95 mol% or more.
- 1,4 butanediol preferably accounts for 80 mol% or more of the total diol component, more preferably 95 mol% or more.
- the dicarboxylic acid component other than terephthalic acid is not particularly limited.
- phthalic acid isophthalic acid, 4,4'-diphenyldicarboxylic acid, 4,4'-diphenyletherdicarboxylic acid, 4, 4 Aromatic dicarboxylic acids such as' —benzophenone dicarboxylic acid, 4, 4'-diphenoxyethane dicarboxylic acid, 4, 4, diphenylsulfone dicarboxylic acid, 2, 6 naphthalene dicarboxylic acid, 1, 2 cycloto Cycloaliphatic dicarboxylic acids such as xanthenedicarboxylic acid, 1,3 cyclohexanedicarboxylic acid, 1,4-cyclohexanedicarboxylic acid, malonic acid, succinic acid, glutaric acid, adipic acid, pimelic acid, suberic acid, azelaic acid, Aliphatic dicarboxylic acids such
- the diol component other than 1,4 butanediol is not particularly limited, and examples thereof include ethylene glycol, diethylene glycol, polyethylene glycol, and propylene glycol. 1, 3, propanediol, polytetramethylene ether glycol, 1,5 pentanediol, neopentyl glycol, 1, 6 hexanediol, 1,8 octanediol and other aliphatic diols, 1,2 cyclohexanediol 1,4-cyclohexanediol, 1,1-cyclohexanedimethylol, 1,4-cyclohexanedimethylol and other alicyclic diols, xylylene glycol, 4,4, -dihydroxybiphenyl, 2, 2 Aromatic diols such as bis (4hydroxyphenyl) propane and bis (4hydroxyphenyl) sulfone can be used.
- a hydroxycarboxylic acid such as glycolic acid, m-hydroxybenzoic acid, p-hydroxybenzoic acid, 6-hydroxy-2-naphthalenecarboxylic acid, p-j8-hydroxyethoxybenzoic acid, etc.
- Monofunctional components such as alkoxy carboxylic acid, stearyl alcohol, benzyl alcohol, stearic acid, benzoic acid, t-butyl benzoic acid, benzoyl benzoic acid, tristralvaleric acid, trimellitic acid, trimesic acid, pyromellitic acid, gallic acid , Trifunctional or polyfunctional components such as trimethylolethane, trimethylolpropane, glycerol and pentaerythritol can be used.
- the PBT used in the present invention is a resin obtained by continuously polymerizing a dicarboxylic acid component mainly composed of terephthalic acid and a diol component mainly composed of 1,4 butanediol. preferable.
- the method of continuous polymerization is not particularly limited, but it is preferable to perform continuous polymerization using a series continuous tank reactor. For example, first, in the presence or absence of an esterification reaction catalyst in one or a plurality of ester reaction tanks, usually 150 to 280 ° C., preferably 180 to 265. C, more preferably 220-240.
- the esterification reaction is carried out for 2 to 5 hours at a temperature of C, usually 20 to 133 kPa, preferably 40 to: L01 kPa, more preferably 50 to 90 kPa (absolute pressure, the same shall apply hereinafter).
- esterification reaction product der Ru oligomer, 1 group or polycondensation reaction tank a plurality groups, presence
- This polycondensation reaction catalyst usually 210 to 280 o C, preferably ⁇ or 220 ⁇ 260 o C, more preferably at a temperature of 230 to 250 ° C, and in at least one polycondensation reaction tank, stirring is usually performed at a reduced pressure of 20 kPa or less, preferably 10 kPa or less, more preferably 5 kPa or less.
- the polycondensation reaction is carried out for 2-5 hours below.
- the PBT obtained by the polycondensation reaction was transferred from the bottom of the polycondensation reaction tank to a polymer extraction die and extracted in the form of a strand, which was cooled with water or with water. Later, it is cut by a pelletizer to form pellets or other granular materials.
- the type of the esterification reaction tank is not particularly limited, and examples thereof include a vertical stirring complete mixing tank, a vertical heat convection mixing tank, and a tower-type continuous reaction tank.
- the type of the polycondensation reaction tank is not particularly limited, and examples thereof include a vertical stirring polymerization tank, a horizontal stirring polymerization tank, and a thin film evaporation polymerization tank.
- the esterification reaction tank and the polycondensation reaction tank can be one, but it is also possible to use multiple tanks in which multiple tanks of the same or different types are connected in series.
- titanium compound used as the esterification reaction catalyst examples include titanium alcohols such as tetramethyl titanate, tetraisopropyl titanate, and tetrabutyl titanate, and titanium phenolates such as tetraphenol titanate.
- the amount of titanium compound catalyst used is greater than 33 ppm and less than 90 ppm in terms of the weight ratio of titanium atoms to the theoretical yield of PBT, preferably 35 to 85 ppm, more preferably 40 to 70 ppm, and particularly preferably 40 to 50 ppm. (Weight ratio).
- tin compounds, lithium compounds, sodium compounds, potassium compounds, magnesium compounds, calcium compounds, antimony compounds and the like can be used in combination as reaction aids.
- the titanium catalyst added during the esterification reaction without adding a new catalyst can be subsequently used as a polycondensation reaction catalyst. Further, a titanium catalyst can be further added during the polycondensation reaction.
- the amount used in this case is the sum of the esterification reaction catalyst, and the weight ratio of titanium atoms is more than 33 ppm and not more than 90 ppm, preferably 35 to 85 ppm, more preferably 40 to 70 ppm, relative to the theoretical yield of PBT. Particularly preferred is 40 to 50 ppm (weight ratio).
- PBT production methods include a method of undergoing an ester exchange reaction between dimethyl terephthalate and the like and 1,4 butanediol, and a method of undergoing a direct esterification reaction of terephthalic acid and 1,4 butanediol. is there.
- Direct esterification using terephthalic acid and 1,4 butanediol as starting materials is advantageous in terms of raw material cost and recovery of by-product tetrahydrofuran.
- PBT having a high crystallization rate can be easily obtained as compared with a method through a transesterification reaction.
- the process for producing PBT has a batch reaction and a continuous reaction. According to the method of continuously polymerizing terephthalic acid and 1,4-butanediol, the molecular weight decreases with the passage of time from the reaction vessel after completion of the reaction, the terminal carboxyl group concentration increases, the residual tetrahydride Avoiding an increase in the amount of furan, it is preferable because high-quality rosin can be easily obtained
- the esterification reaction tank at least a portion of 1,4 butanediol is supplied to the esterification reaction tank independently of terephthalic acid in the presence of a titanium catalyst.
- a step of continuously esterifying 1,4 butanediol is employed. That is, in the present invention, haze and foreign matters derived from the catalyst are reduced and the catalytic activity is not lowered. Therefore, in addition to 1,4 butanediol supplied together with terephthalic acid as a raw slurry or solution, Independent of terephthalic acid, 1,4-butanediol is supplied to the ester tank.
- the 1,4 butanediol is sometimes referred to as “separately supplied 1,4 butanediol”.
- the above-mentioned "separately supplied 1,4 butanediol” can be used with fresh 1,4 butanediol that is unrelated to the process.
- “separately supplied 1,4 butanediol” collects 1,4 butanediol, which is also distilled from the ester fermentor reaction tank, with a condenser, etc., or keeps it in a temporary tank or the like to the reaction tank. It can also be refluxed or supplied as 1,4 butanediol with increased purity by separating and purifying impurities.
- 1,4 butanediol distilled from an ester ester reaction vessel usually includes water, tetrahydrofuran (hereinafter abbreviated as "THF"), dihydrofuran, alcohol and the like in addition to the 1,4 butanediol component. Contains ingredients. Therefore, it is preferable that the above-mentioned distilled 1,4 butanediol is separated and purified from components such as water and THF after being collected by a condenser or the like, and returned to the reaction vessel.
- THF tetrahydrofuran
- the reaction liquid phase section refers to the liquid phase side of the gas-liquid interface of the Esterii reaction tank.
- the ratio of returning directly to the liquid phase of the reaction solution is usually 30% by weight or more, preferably 50% by weight or more, more preferably 80% by weight or more, and particularly preferably 90% by weight or more.
- the temperature of the "separately fed 1,4 butanediol" upon returning to the reactor is usually 50 to 220 ° C, preferably 100 to 200 ° C, more preferably 150 to 190 ° C. .
- the temperature of “separately supplied 1,4-butanediol” is too high, the amount of THF by-product tends to increase, and when it is too low, the heat load increases and energy loss tends to occur.
- the reaction liquid-liquid phase part indicates the liquid phase side of the gas-liquid interface of the ester liquid reaction tank, and the direct supply to the reaction liquid-liquid phase part uses piping or the like, and the titanium catalyst is the gas in the reactor. This means that it is directly supplied to the liquid phase part without going through the phase part.
- the proportion of the titanium catalyst added directly to the liquid phase of the reaction liquid is usually 30% by weight or more, preferably 50% by weight or more, more preferably 80% by weight or more, and particularly preferably 90% by weight or more.
- the titanium catalyst may be dissolved directly in a solvent or the like and directly in an esterification reaction tank.
- 1,4 butanediol it is preferable to dilute with a solvent such as
- the concentration at this time is usually 0.01 to 20% by weight, preferably 0.05 to LO weight%, more preferably 0.08 to 8 weight%, as the concentration of the titanium catalyst with respect to the whole solution.
- the water concentration in the solution is usually 0.05 to: L 0% by weight.
- the temperature during preparation of the solution is usually 20 to 150 from the viewpoint of preventing aggregation if it is deactivated.
- the catalyst solution is preferably mixed with separately supplied 1, 4 butanediol and piping and supplied to the ester reaction reactor from the viewpoint of preventing deterioration, preventing precipitation, and preventing deactivation.
- the molar ratio of terephthalic acid to 1,4 butanediol preferably satisfies the following formula (I).
- BM is the number of moles of 1,4-butanediol supplied from the outside to the esterification reactor per unit time
- TM is the number of moles of terephthalic acid fed from the outside to the esterification reactor per unit time.
- 1,4 butanediol supplied from the outside to the esterification reaction tank refers to 1,4 butanediol supplied together with terephthalic acid as a raw slurry or solution, and is independent of these. 1,4 butanediol fed into the reactor, 1,4 butanediol used as a solvent for the catalyst, etc.
- BMZTM value is smaller than 1.1, the conversion rate is reduced and the catalyst is deactivated. If it is larger than 5.0, the thermal efficiency is decreased and the by-products such as THF increase. It tends to be.
- the value of BM / TM is preferably ⁇ , preferably ⁇ 1.5 to 4.5, more preferably ⁇ 2. 0 to 4.0, and particularly preferably 3.1 to 3.8.
- FIG. 1 is an explanatory diagram of an example of the esterification reaction step or transesterification reaction step employed in the present invention
- FIG. 2 is an explanatory diagram of an example of a polycondensation step employed in the present invention.
- the raw material terephthalic acid is usually mixed in a raw material mixing tank (not shown). It is mixed with diol and supplied to the reaction tank (A) in the form of slurry from the raw material supply line (1).
- the raw material is a dialkyl terephthalate
- it is usually supplied as a molten liquid to the reaction tank (A) independently of 1,4-butanediol.
- the titanium catalyst is preferably made into a solution of 1,4 butanediol in a catalyst adjusting tank (not shown) and then supplied from the catalyst supply line (3).
- Fig. 1 shows a mode in which a catalyst supply line (3) is connected to a recycle line for recycle 1,4 butanediol (2), mixed, and then fed to the liquid phase part of the reaction tank (A). .
- the gas that also distills from the reaction tank (A) is separated into a high-boiling component and a low-boiling component in the rectifying column (C) via the distillation line (5).
- the main components of the high boiling component are 1,4 butanediol
- the main components of the low boiling component are water and THF in the case of direct polymerization.
- the high-boiling components separated in the rectification column (C) are extracted from the extraction line (6), passed through the pump (D), and partly from the recirculation line (2) to the reaction tank (A) Part of it is returned to the rectifying tower (C) from the circulation line (7).
- the surplus is extracted from the extraction line (8).
- the light boiling components separated in the rectification column (C) are extracted from the gas extraction line (9), condensed in the capacitor (G), and passed through the condensate line (10) and then into the tank (F). Is temporarily stored.
- a part of the light boiling components collected in the tank (F) is returned to the rectification column (C) through the extraction line (11), the pump (E) and the circulation line (12), and the remainder is extracted. It is extracted outside through the exit line (13).
- the condenser) is connected to an exhaust device (not shown) via a vent line (14).
- the oligomer produced in the reaction tank (A) is withdrawn via a withdrawal pump (B) and a withdrawal line (4).
- the catalyst supply line (3) is connected to the recirculation line (2), but both may be independent.
- the raw material supply line (1) may be connected to the liquid phase part of the reaction tank (A).
- the oligomer supplied from the extraction line (4) shown in FIG. 1 is polycondensed under reduced pressure in the first polycondensation reaction tank (a) to become a prepolymer, and then extracted. It is supplied to the second polycondensation reaction tank (d) via the output gear pump (c) and the extraction line (L1). In the second polycondensation reaction tank (d), polycondensation usually proceeds at a lower pressure than that of the first polycondensation reaction tank (a) to become a polymer. The obtained polymer passes through the extraction gear pump (e) and the extraction line (L3).
- PBT having a titanium content, a terminal carboxyl group concentration, and a intrinsic viscosity as defined in the present invention can be obtained. Further, the PBT used in the present invention was melt polymerized with terephthalic acid and 1,4 butanediol as main raw materials in the same manner as described above to obtain a low molecular weight PBT having a desired titanium content and terminal carboxyl group concentration. Thereafter, it can also be obtained by a method of solid-phase polymerization until a desired intrinsic viscosity is obtained.
- This flame retardant PBT composition is prepared by blending the above-mentioned PBT with a brominated aromatic compound flame retardant and an acid-antimony compound.
- the brominated aromatic compound-based flame retardant used in the present invention is an aromatic compound known as a brominated flame retardant used for rosin, such as an epoxy oligomer of tetrabromobisphenol A, etc.
- a brominated flame retardant used for rosin such as an epoxy oligomer of tetrabromobisphenol A, etc.
- Brominated epoxy resin, poly (pentabromobenzyl acrylate), polybromophenol ether, brominated polystyrene, brominated imide, brominated polycarbonate and the like are preferably used because of its good thermal stability. Two or more of these brominated aromatic compound-based flame retardants may be used in combination.
- the amount of the brominated aromatic compound-based flame retardant is 3 to 50 parts by weight with respect to 100 parts by weight of PBT.
- the amount of the brominated aromatic compound-based flame retardant is preferably 5 to 40 parts by weight, more preferably 6 to 30 parts by weight with respect to 100 parts by weight of PBT.
- antimony compound examples include antimony oxide and antimonate, and specific examples thereof include antimony trioxide (Sb 2 O 4, antimony tetroxide (Sb 2 O 3),
- Oxides such as antimony oxide (Sb o) and antimonates such as sodium antimonate
- the compounding amount of the antimony compound is 1 to 30 parts by weight with respect to 100 parts by weight of PBT.
- the amount of the antimony compound is preferably 2 to 25 parts by weight, more preferably 3 to 20 parts by weight, based on 100 parts by weight of PBT.
- This flame-retardant PBT composition is formed by blending at least one compound selected from phosphate ester or phospho-tolyl power and melamine cyanurate with the aforementioned PBT.
- phosphate esters include a wide range of phosphate esters. Specific examples include trimethyl phosphate, triethyl phosphate, tributyl phosphate, trioctyl phosphate, tribubutychuccinorephosphate, triphenylenophosphate, tricresinorephosphate, cresyl diphenol phosphate, octyl diphosphate phosphate, etc.
- a phosphate ester represented by the following general formula (1) is preferable.
- R 9 represents p-phenol. -Len group, m-phenylene group, 4, 4 ', -bi-phenylene group or a divalent group whose power is also selected below.
- ⁇ are preferably an alkyl group having 6 or less carbon atoms, more preferably an alkyl group having 2 or less carbon atoms, and particularly preferably a methyl group from the viewpoint of improving the hydrolysis resistance of the PBT composition.
- m is preferably 1 to 3, and more preferably 1.
- R 9 is preferably a p-phenylene group or an m-phenylene group, more preferably an m-phenylene group.
- a phospho-tolyl compound having a group represented by the following general formula (2) can also be suitably used.
- X represents O— , —S— , —NH 2 or a direct bond.
- R 17 and R 1Q each represent an aryl group, alkyl group, or cycloalkyl group having 1 to 20 carbon atoms.
- R 17 — X— and R 18 — X— may be the same or different, and n represents an integer of 1 to 12.
- R 17 and R 18 include optionally substituted alkyl groups such as a methyl group, an ethyl group, a butyl group, a hexyl group, and a benzyl group, Examples thereof include cycloalkyl groups such as cyclohexyl, aryl groups such as a phenyl group and a naphthyl group.
- n is preferably 3 to 10, more preferably 3 or 4.
- the phospho-trilyl compound of the general formula (2) may be a linear polymer or a cyclic polymer, but a cyclic polymer is preferred.
- X is preferably O or 1 NH, particularly preferably 1 O.
- Specific examples of the phospho-tolyl compound represented by the general formula (2) include hexaphenoxy clotriphosphazene, hexa (hydroxyphenoxy) cyclotriphosphazene, and otatapheno. Examples thereof include xylcyclotetraphosphazene and octa (hydroxyphenoxy) cyclotetraphosphazene.
- the amount of the phosphate ester or phospho-tolyl is 3 to 50 parts by weight, preferably 10 to 40 parts by weight, with respect to 100 parts by weight of PBT.
- Phosphoric ester or phospho-tolyl compounding amount When the amount is less than 3 parts by weight, the flame retardancy is high, and a PBT composition cannot be obtained. When the amount exceeds 50 parts by weight, the mechanical strength of the PBT composition decreases.
- Melamine cyanurate used in the present invention is a substantially equimolar reaction product of cyanuric acid and melamine.
- an aqueous solution of cyanuric acid and an aqueous solution of melamine are mixed, and the temperature is 90 to 100 ° C.
- the reaction can be carried out with stirring and the resulting precipitate can be filtered.
- the particle size of the melamine cyanurate is usually from 0.01 to: LOOO / z m, preferably from 0.01 to 500 m.
- the compounding amount of melamine cyanurate is 1 to 50 parts by weight, preferably 10 to 40 parts by weight with respect to 100 parts by weight of PBT.
- the compounding amount of melamine cyanurate is less than 1 part by weight, a flame-retardant high-grade PBT composition cannot be obtained, and when it exceeds 50 parts by weight, the mechanical strength of the PBT composition decreases.
- the flame retardant PBT composition of the present invention described above can further contain a reinforcing filler.
- the type of the reinforcing filler is not particularly limited, and examples thereof include inorganic fibers such as glass fiber, carbon fiber, silica'alumina fiber, zirconia fiber, boron fiber, boron nitride fiber, potassium nitride potassium titanate fiber, and metal fiber. And organic fibers such as aromatic polyamide fibers and fluorine resin fibers. These reinforcing fillers can be used in combination of two or more. Of these, inorganic fillers, particularly glass fibers, are preferred.
- the average fiber diameter is usually 1 to 100 m, preferably 2 to 50 m, more preferably 3 to 30 m, particularly preferably 5 to 5 m. ⁇ 20 / zm.
- the average fiber length is usually 0.1 to 20 mm, preferably 1 to L0 mm, and more preferably 2 to 0.5 mm.
- the reinforcing filler is used as a sizing agent or surface treatment to improve interfacial adhesion with PBT. It is preferable to use after surface treatment with an agent.
- the sizing agent or surface treatment agent include functional compounds such as epoxy compounds, acrylic compounds, isocyanate compounds, silane compounds, and titanate compounds.
- the reinforcing filler can be surface-treated with a bundling agent or a surface treatment agent in advance. When a PBT composition is prepared, a sizing agent or a surface treatment agent can be added to the surface treatment.
- the compounding amount of the reinforcing filler is usually 150 parts by weight, preferably 5 to 100 parts by weight, and more preferably 10 to 70 parts by weight with respect to 100 parts by weight of PBT.
- the flame-retardant PBT composition of the present invention may contain other fillers together with the reinforcing filler.
- Other fillers include, for example, plate-like inorganic fillers, ceramic beads, asbestos, wollastonite, talc, clay, my strength, zeolite, kaolin, potassium titanate, barium sulfate, titanium oxide, and titanium oxide. , Acid aluminum, magnesium hydroxide, and the like.
- the plate-like inorganic filler include glass flakes, mica, and metal foil. Of these, glass flakes are particularly suitable.
- the flame retardant PBT composition of the present invention may contain other flame retardants other than brominated aromatic compounds, antimony compounds, phosphate esters, phospho-tolyl, and melamine cyanurate.
- flame retardants include, for example, fluorine-based resin, organochlorine compounds, phosphorus compounds, other organic flame retardants, and inorganic flame retardants.
- An example of the fluorinated resin is polytetrafluoroethylene fiber.
- the phosphorus compound include phosphoric acid ester, polyphosphoric acid, ammonium polyphosphate, and red phosphorus.
- examples of other organic flame retardants include nitrogen compounds such as melamine and cyanuric acid.
- inorganic flame retardants include hydroxyaluminum hydroxide, magnesium hydroxide, silicon compounds, and boron compounds.
- a dripping inhibitor particularly polytetrafluoroethylene having a fibril forming ability, as a dripping inhibitor, from the viewpoint of improving flame retardancy.
- Fibril-forming ability refers to the tendency to easily disperse in PBT and to bind to itself (polytetrafluoroethylene) to form a fibrous material.
- Polytetrafluoroethylene having fibril-forming ability is classified as type 3 in the ASTM standard.
- the amount of polytetrafluoroethylene is usually 0.1 to 5 parts by weight, preferably 0.2 to 4 parts by weight, more preferably 0.3 to 3 parts by weight, based on 100 parts by weight of PBT. It is. When the blending amount of polytetrafluoroethylene is less than 0.1 parts by weight, the effect of blending is not exhibited, and when it exceeds 5 parts by weight, processability such as extrudability and moldability is impaired.
- a conventional additive or the like can be blended with this type of resin composition, if necessary.
- additives include stabilizers such as antioxidants and heat-resistant stabilizers, lubricants, mold release agents, catalyst deactivators, crystal nucleating agents, and crystallization accelerators.
- stabilizers such as UV absorbers and weathering stabilizers, colorants such as dyes and pigments, antistatic agents, foaming agents, plasticizers, impact resistance improvers, etc. It can also be blended. These can be added during or after the polymerization.
- the flame retardant PBT composition of the present invention includes polyethylene, polypropylene, acrylic resin, polycarbonate, polyamide, polyphenylene sulfide, polyethylene terephthalate, liquid crystal polyester, polyacetal, polyphenylene as necessary.
- Thermosetting resin such as oxide resin, epoxy resin, phenol resin, melamine resin, and silicone resin may be blended. Two or more of these rosins may be used in combination.
- the method for producing the flame-retardant PBT composition of the present invention is not particularly limited, and is a batch blending method in which necessary components are mixed, melted and kneaded by a screw-type extruder, and pelletized, and a screw type extruder.
- the PBT is melted and kneaded by the above method, and the other blending method of feeding the other ingredients of the extruder, feeding and kneading and then blending and blending the pellets.
- the molding method of the molded body of the flame retardant PBT composition of the present invention is not particularly limited, and is a molding method generally used for thermoplastic resin, that is, injection molding, hollow molding, extrusion molding, A molding method such as press molding can be applied.
- the acid value and ken value were also calculated by the following formula (II).
- the acid value was obtained by dissolving the oligomer in dimethylformamide and titrating with a 0.1N KOHZ methanol solution.
- the saponification value was determined by hydrolyzing the oligomer with 0.5N KOH / ethanol solution and titrating with 0.5N hydrochloric acid.
- PBT was wet-decomposed with high-purity sulfuric acid and nitric acid for the electronics industry and measured using a high-resolution ICP (Inductively Coupled Plasma) —MS (MassSpectrometer) (manufactured by ThermoQuestnet).
- ICP Inductively Coupled Plasma
- MS MassSpectrometer
- Tetrabutyl titanate and terephthalic acid and 1,4 butanediol as raw materials Three types of PBT shown in Table 1 were produced by changing the amount of the medium. Specifically, PBT was produced in the following manner using the esteri process shown in Fig. 1 and the polycondensation process shown in Fig. 2.
- the internal temperature of the reaction tank (A) is 230 ° C
- the pressure is 78 kPa
- the produced water, tetrahydrofuran, and excess 1,4 butanediol are distilled from the distillation line (5), followed by rectification.
- the high boiling component and the low boiling component were separated in the tower (C).
- the high-boiling component at the bottom of the column after the system is stabilized is 98% by weight or more of 1,4 butanediol, and the extraction line (8) is used so that the liquid level in the rectification column (C) is constant. A part of it was extracted outside.
- low-boiling components were extracted from the top of the column in the form of gas, condensed by the condenser (G), and extracted from the extraction line (13) so that the liquid level in the tank (F) was constant.
- a certain amount of the oligomer produced in the reaction tank (A) is extracted from the extraction line (4) using the pump (B), and the ester ratio at the outlet of the reaction tank (A) is 96% or more.
- the residence time was adjusted as follows.
- the oligomer extracted from the extraction line (4) was continuously supplied to the first polycondensation reaction tank (a).
- the internal temperature of the first polycondensation reaction tank (a) was 240 ° C, the pressure was 2. lkPa, and the liquid level was controlled so that the residence time was 120 minutes.
- An initial polycondensation reaction was carried out while extracting water, tetrahydrofuran, and 1,4 butanediol from a vent line (L2) connected to a decompressor (not shown). The extracted reaction liquid was continuously supplied to the second polycondensation reaction tank (d).
- the conditions (inner temperature, pressure, residence time) of the second polycondensation reaction tank (d) were controlled as shown in Table 1.
- the obtained polymer is continuously extracted in a strand from the die head (g) via the extraction line (L3) by the extraction gear pump (e) and cut by the rotary cutter (h). It was.
- each component was weighed in the ratio shown in Table 3 or Table 4, and all the components other than glass fiber were mixed together.
- a twin screw extruder Nippon Steel Works, Model TEX30C, screw diameter 30mm
- cylinder feed temperature 255 ° C
- screw rotation speed 200rpm
- An ISO test piece for measuring mechanical properties was molded from the obtained pellets in the following manner. That is, using an injection molding machine (model SG-75SYCAP-MIII) manufactured by Sumitomo Heavy Industries, Ltd., pellets were molded under conditions of a cylinder temperature of 250 ° C and a mold temperature of 80 ° C.
- the performance was evaluated by the following test method, and the results are shown in Table 3 or Table 4.
- flammability was tested using 5 specimens each of 1Z32 inch thickness. For each of the five test pieces, the total combustion time after the second flame contact was defined as the total combustion time. A long total burning time means that even if the standard is passed, the specimen thickness becomes thin, and in the case of a prescription with a low flame retardant content, it tends to be rejected.
- TS is defined as the average tensile strength of 5 times. After that, put the same specimen in a pressure vessel filled with pure water so that it does not come into direct contact with water (put it in the space of the pressure vessel), seal it, and then treat it under saturated steam pressure at 121 ° C for 100 hours. Similarly, a tensile test was carried out (TS ′ is the average tensile strength of 5 times after treatment). From these values, the strength retention was calculated by the following formula (IV). The higher the strength retention, the better the hydrolytic resistance.
- the compositions of the examples have a high possibility of maintaining V-0 even in a blended formulation with few flame retardants! Moreover, the strength retention in the hydrolysis resistance test is also superior to the corresponding comparative example, and it can be seen that the PBT composition of the present invention retains both flame retardancy and hydrolysis resistance at good levels.
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Abstract
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CN101525473B (zh) * | 2008-03-04 | 2012-01-18 | 东丽纤维研究所(中国)有限公司 | 一种玻纤增强聚对苯二甲酸丁二醇酯 |
CN101525474B (zh) * | 2008-03-04 | 2012-06-27 | 东丽纤维研究所(中国)有限公司 | 一种阻燃聚对苯二甲酸丁二醇酯 |
JP2010006937A (ja) * | 2008-06-26 | 2010-01-14 | Wintech Polymer Ltd | 難燃性ポリブチレンテレフタレート樹脂組成物及び成形品 |
CN101928447B (zh) * | 2009-06-24 | 2014-08-27 | 上海金发科技发展有限公司 | 无卤阻燃增强聚对苯二甲酸丁二醇酯组合物及其制备方法 |
CN101633774B (zh) * | 2009-08-28 | 2012-04-25 | 金发科技股份有限公司 | 一种pbt模塑组合物及其制备方法 |
TWI549985B (zh) * | 2009-11-10 | 2016-09-21 | Wintech Polymer Ltd | Polybutylene terephthalate resin composition |
EP2711383B1 (en) * | 2011-05-18 | 2018-07-04 | Toray Industries, Inc. | Catalyst solution for use in production of polyester, and method for producing polyester resin using same |
MY158378A (en) * | 2013-06-13 | 2016-09-26 | Wintech Polymer Ltd | Polybutylene terephthalate resin composition and injection-molded article |
WO2017043334A1 (ja) * | 2015-09-11 | 2017-03-16 | 三菱エンジニアリングプラスチックス株式会社 | ポリエステル系樹脂組成物及びその製造方法 |
JP6326102B2 (ja) * | 2015-09-11 | 2018-05-16 | 三菱エンジニアリングプラスチックス株式会社 | ポリエステル系樹脂組成物及びその製造方法 |
CN107266877A (zh) * | 2017-07-21 | 2017-10-20 | 武汉顺威赛特工程塑料有限公司 | 一种低气味增强阻燃pbt材料及其制备方法 |
CN107266880B (zh) * | 2017-07-24 | 2019-04-30 | 武汉顺威赛特工程塑料有限公司 | 一种高流动增强阻燃pbt材料及其制备方法 |
EP3858904A4 (en) * | 2018-09-27 | 2022-06-22 | Sekisui Plastics Co., Ltd. | FOAM THERMOPLASTIC POLYESTER RESIN FILM, FOAM THERMOPLASTIC POLYESTER RESIN CONTAINER, METHOD FOR PRODUCTION OF FOAM THERMOPLASTIC POLYESTER RESIN FILM AND METHOD FOR PRODUCTION OF FOAM THERMOPLASTIC POLYESTER RESIN CONTAINER |
US20230069128A1 (en) * | 2019-12-17 | 2023-03-02 | Polyplastics Co., Ltd. | Polybutylene terephthalate resin composition, molded article, thickening inhibitor for polybutylene terephthalate resin compositions, and hydrolysis inhibitor for molded articles formed from polybutylene terephthalate resin compositions |
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