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WO2018012138A1 - Composition de résine pour soudage au laser, produit moulé, produit moulé composite et son procédé de production, et procédé pour améliorer la transmissivité de la lumière laser - Google Patents

Composition de résine pour soudage au laser, produit moulé, produit moulé composite et son procédé de production, et procédé pour améliorer la transmissivité de la lumière laser Download PDF

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Publication number
WO2018012138A1
WO2018012138A1 PCT/JP2017/020642 JP2017020642W WO2018012138A1 WO 2018012138 A1 WO2018012138 A1 WO 2018012138A1 JP 2017020642 W JP2017020642 W JP 2017020642W WO 2018012138 A1 WO2018012138 A1 WO 2018012138A1
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Prior art keywords
resin composition
polybutylene terephthalate
molded product
terephthalate resin
laser light
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Ceased
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PCT/JP2017/020642
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English (en)
Japanese (ja)
Inventor
耕一 坂田
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Wintech Polymer Ltd
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Wintech Polymer Ltd
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Priority to JP2018527433A priority Critical patent/JP6993971B2/ja
Publication of WO2018012138A1 publication Critical patent/WO2018012138A1/fr
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    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B29—WORKING OF PLASTICS; WORKING OF SUBSTANCES IN A PLASTIC STATE IN GENERAL
    • B29C—SHAPING OR JOINING OF PLASTICS; SHAPING OF MATERIAL IN A PLASTIC STATE, NOT OTHERWISE PROVIDED FOR; AFTER-TREATMENT OF THE SHAPED PRODUCTS, e.g. REPAIRING
    • B29C65/00—Joining or sealing of preformed parts, e.g. welding of plastics materials; Apparatus therefor
    • B29C65/02—Joining or sealing of preformed parts, e.g. welding of plastics materials; Apparatus therefor by heating, with or without pressure
    • B29C65/14—Joining or sealing of preformed parts, e.g. welding of plastics materials; Apparatus therefor by heating, with or without pressure using wave energy, i.e. electromagnetic radiation, or particle radiation
    • B29C65/16—Laser beams
    • 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
    • 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
    • C08K3/34—Silicon-containing compounds
    • 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
    • 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

Definitions

  • the present invention relates to a laser-welded polybutylene terephthalate resin composition and molded article, a composite molded article and a method for producing the same, and a method for improving the laser light transmittance of a polybutylene terephthalate resin composition.
  • FIG. 1 is an explanatory diagram of a general laser welding method. As shown in FIG. 1, in laser welding, a so-called transmission-side molded product 3 formed of a resin composition that transmits laser light 2 emitted from a light source 1 and a resin composition that absorbs laser light 2 are formed.
  • the so-called absorption-side molded product 4 is overlapped so that the surfaces to be joined face each other, and the laser beam 2 is irradiated from the transmission-side molded product 3 side toward the absorption-side molded product 4 side.
  • the overlapped interface generates heat and melts and joins. Therefore, the resin composition used for the transmission-side molded product 3 is preferably as the laser beam transmittance is higher (lower absorption rate), and the resin composition used for the absorption-side molded product 4 is laser beam absorption rate. Is higher (lower transmittance).
  • Polybutylene terephthalate resins are excellent in various properties such as heat resistance, chemical resistance, electrical properties, mechanical properties, and moldability, and are therefore used in many applications.
  • the polybutylene terephthalate-based resin itself is an opaque crystalline resin and can be easily colored with a colorant such as carbon black. Therefore, the polybutylene terephthalate resin can be easily used as the absorption-side molded product 4.
  • a polybutylene terephthalate resin is used for the transmission-side molded product 3, it is necessary to increase the laser beam transmittance of the resin.
  • a resin having a low crystallinity and a high transparency such as a polycarbonate resin or a polyethylene terephthalate resin is added as an alloy material to the polybutylene terephthalate resin.
  • Patent Document 1 a resin having a low crystallinity and a high transparency such as a polycarbonate resin or a polyethylene terephthalate resin is added as an alloy material to the polybutylene terephthalate resin.
  • an inorganic filler may be contained in the resin composition for the purpose of increasing the mechanical strength of the obtained molded product. However, when an inorganic filler is contained, laser light is scattered and the transmittance is lowered.
  • Patent Document 2 JP 2004-315805 A JP 2005-1350 A
  • An object of the present invention is to provide a laser-welded polybutylene terephthalate-based resin composition and a molded article having high laser beam permeability. It is another object of the present invention to provide a composite molded article, a method for producing the same, and a method for improving the laser light transmittance of a polybutylene terephthalate resin composition.
  • the polybutylene terephthalate resin itself is opaque and has low laser light transmittance, so even if the refractive index of the inorganic filler is devised, it is not possible to further increase the laser light transmittance. difficult.
  • the present inventor has found that a polybutylene terephthalate-based resin is used without using an alloy material when a layered silicate mineral usually used as an inorganic filler has a predetermined particle size. As a result, it was found that the transmittance of the laser beam can be improved, and the present invention has been completed.
  • a laser-welded polybutylene terephthalate resin composition according to the present invention comprises a polybutylene terephthalate resin and a layered silicate mineral having an average primary particle size of 1.0 ⁇ m to 5.0 ⁇ m. It is characterized by containing.
  • the content of the laser light transmittance improver is preferably 0.01 parts by mass or more and 20 parts by mass or less with respect to 100 parts by mass of the polybutylene terephthalate resin.
  • the layered silicate mineral preferably contains talc.
  • an inorganic filler can be further contained.
  • the present invention can be a resin composition for a laser light transmission side molded article.
  • the molded article for laser welding according to the present invention includes any one of the above polybutylene terephthalate resin compositions.
  • This molded product has a laser light transmittance of a wavelength of 800 nm to 1000 nm (especially 900 nm to 1000 nm) at an optical path length of 1.5 mm, compared with a molded product using a polybutylene terephthalate resin composition that does not contain a laser light transmission improver Can be configured to be higher.
  • the first molded product including the polybutylene terephthalate resin composition described above and the second molded product including the thermoplastic resin composition are laser-welded. It is a composite molded product.
  • the thermoplastic resin composition is preferably a polybutylene terephthalate resin composition that does not contain a laser light transmission improver.
  • the method for producing a composite molded product according to the present invention includes a second molded product including at least a part of a first molded product including the polybutylene terephthalate resin composition according to any one of the above and a thermoplastic resin composition. And at least a part of the first molded product and at least a part of the second molded product are welded by irradiating a laser beam from the first molded product side. .
  • the method for improving the laser light transmittance of the polybutylene terephthalate resin composition according to the present invention comprises blending a polybutylene terephthalate resin composition with a layered silicate mineral having an average primary particle size of 1.0 ⁇ m or more and 5.0 ⁇ m or less. It is characterized by doing.
  • the present invention it is possible to provide a polybutylene terephthalate-based resin composition and a molded product with laser welding having high laser beam transmissivity. Moreover, the composite molded article, its manufacturing method, and the laser beam transmittance improving method of a polybutylene terephthalate resin composition can be provided.
  • the polybutylene terephthalate resin composition (hereinafter, also referred to as “resin composition”) of the present embodiment is a laser-welded polybutylene terephthalate resin composition, and is a polybutylene terephthalate resin (hereinafter referred to as “PBT system”). Resin ”) and a laser light transmission improver containing a layered silicate mineral having a predetermined particle size.
  • PBT system polybutylene terephthalate resin
  • Resin a laser light transmission improver containing a layered silicate mineral having a predetermined particle size.
  • the polybutylene terephthalate-based resin is a homopolyester containing butylene terephthalate as a main component (for example, about 50% by mass to 100% by mass, preferably 60% by mass to 100% by mass, more preferably about 75% by mass to 100% by mass).
  • (Polybutylene terephthalate) or copolyester butylene terephthalate copolymer or polybutylene terephthalate copolyester.
  • copolymerizable monomer in a copolyester (butylene terephthalate copolymer or modified PBT resin), dicarboxylic acid excluding terephthalic acid, 1,4-butanediol is used. Excluded diol, oxycarboxylic acid, lactone and the like.
  • the copolymerizable monomers can be used alone or in combination of two or more.
  • dicarboxylic acid examples include aliphatic dicarboxylic acids (for example, succinic acid, glutaric acid, adipic acid, pimelic acid, suberic acid, azelaic acid, sebacic acid, undecanedicarboxylic acid, dodecanedicarboxylic acid, hexadecanedicarboxylic acid, dimer acid, etc.
  • aliphatic dicarboxylic acids for example, succinic acid, glutaric acid, adipic acid, pimelic acid, suberic acid, azelaic acid, sebacic acid, undecanedicarboxylic acid, dodecanedicarboxylic acid, hexadecanedicarboxylic acid, dimer acid, etc.
  • C 4-40 dicarboxylic acids preferably C 4-14 dicarboxylic acids
  • cycloaliphatic dicarboxylic acids eg, C 8-12 dicarboxylic acids such as hexahydrophthalic acid, hexahydroisophthalic acid, hexahydroterephthalic acid, and hymic acid
  • Acid aromatic dicarboxylic acids excluding terephthalic acid (eg, phthalic acid, isophthalic acid; naphthalenedicarboxylic acid such as 2,6-naphthalenedicarboxylic acid; 4,4′-diphenyldicarboxylic acid, 4,4′-diphenylether dicarboxylic acid) , 4,4'-Diphenylmethane dicar Phosphate, 4,4'-diphenyl ketone C 8-16 diphenyl dicarboxylic acid such as dicarboxylic acids), or reactive derivatives thereof [for example, lower alkyl esters of phthalic
  • diol examples include linear or branched aliphatic alkylene glycols other than 1,4-butanediol (for example, ethylene glycol, trimethylene glycol, propylene glycol, neopentyl glycol, hexanediol, octanediol, decanediol).
  • linear or branched aliphatic alkylene glycols other than 1,4-butanediol for example, ethylene glycol, trimethylene glycol, propylene glycol, neopentyl glycol, hexanediol, octanediol, decanediol.
  • Linear C 2-12 aliphatic glycols preferably linear or branched C 2-10 aliphatic glycols
  • (poly) oxyalkylene glycols glycols having a plurality of oxy C 2-4 alkylene units, for example Diethylene glycol, dipropylene glycol, ditetramethylene glycol, triethylene glycol, tripropylene glycol, polytetramethylene glycol, etc.
  • alicyclic diols eg, 1,4-cyclohexanediol, 1,4-cyclohexane
  • aromatic diol e.g., hydroquinone, resorcinol, C 6-14 aromatic diols such as naphthalene diol; biphenol; bisphenols; xylylene glycol and the like
  • polyols such as glycerol, a trimethylol propane, a
  • bisphenols examples include bis (4-hydroxyphenyl) methane (bisphenol F), 1,1-bis (4-hydroxyphenyl) ethane (bisphenol AD), 1,1-bis (4-hydroxyphenyl) propane, , 2-bis (4-hydroxyphenyl) propane (bisphenol A), 2,2-bis (4-hydroxy-3-methylphenyl) propane, 2,2-bis (4-hydroxyphenyl) butane, 2,2- Bis (hydroxyaryl) C 1 such as bis (4-hydroxyphenyl) -3-methylbutane, 2,2-bis (4-hydroxyphenyl) hexane, 2,2-bis (4-hydroxyphenyl) -4-methylpentane -6 alkane; 1,1-bis (4-hydroxyphenyl) cyclopentane, 1,1-bis (4-hydride) Bis (hydroxyaryl) C 4-10 cycloalkanes such as loxyphenyl) cyclohexane; 4,4′-dihydroxydiphenyl ether; 4,4′-dihydroxydiphenyl
  • alkylene oxide adduct examples include C 2-3 alkylene oxide adducts of bisphenols (eg, bisphenol A, bisphenol AD, bisphenol F, etc.), such as 2,2-bis- [4- (2-hydroxyethoxy) phenyl. Propane, diethoxylated bisphenol A (EBPA), 2,2-bis- [4- (2-hydroxypropoxy) phenyl] propane, dipropoxylated bisphenol A and the like.
  • the number of added moles of alkylene oxide C2-3 alkylene oxide such as ethylene oxide and propylene oxide
  • oxycarboxylic acid examples include oxybenzoic acid, oxynaphthoic acid, hydroxyphenylacetic acid, glycolic acid, oxycaproic acid and other oxycarboxylic acids or derivatives thereof.
  • Lactones include C 3-12 lactones such as propiolactone, butyrolactone, valerolactone, caprolactone (eg, ⁇ -caprolactone, etc.), and the like.
  • Preferable copolymerizable monomers include diols or dicarboxylic acids.
  • the diol include C 2-6 alkylene glycol (linear or branched alkylene glycol such as ethylene glycol, trimethylene glycol, propylene glycol, hexanediol, etc.), and an oxyalkylene unit having a repeating number of about 2 to 4.
  • polyoxy C 2-4 alkylene glycol diethylene glycol, etc.
  • bisphenols bisphenols or alkylene oxide adducts thereof
  • Dicarboxylic acids include C 6-12 aliphatic dicarboxylic acids (adipic acid, pimelic acid, suberic acid, azelaic acid, sebacic acid, etc.), asymmetric aromatic dicarboxylic acids in which the carboxyl group is substituted at the asymmetric position of the arene ring, 1, 4-cyclohexanedimethanol and the like can be mentioned.
  • aromatic compounds such as alkylene oxide adducts of bisphenols (particularly bisphenol A), and asymmetric aromatic dicarboxylic acids [phthalic acid, isophthalic acid, and reactive derivatives thereof (dimethylisophthalic acid (DMI)) Etc.) are preferred.
  • the polybutylene terephthalate resin is preferably a homopolyester (polybutylene terephthalate) and / or a copolymer (polybutylene terephthalate copolyester), and the proportion (modification amount) of the copolymerizable monomer is usually 45 mol% or less ( For example, it may be about 0 to 40 mol%), preferably 35 mol% or less (for example, about 0 to 35 mol%), or 30 mol% or less (about 0 to 30 mol%).
  • the proportion of the copolymerizable monomer in the copolymer can be selected, for example, from the range of about 0.01 to 30 mol%, and is usually 1 to 30 mol%, preferably 3 to 25 mol%. More preferably, it is about 5 to 20 mol% (for example, 5 to 15 mol%).
  • the proportion of the copolymerizable monomer in the copolymer can be selected from the range of, for example, about 0.1 to 45 mol%, and is usually 1 to 40 mol% (eg, 5 to 40 mol%) %), Preferably about 10 to 35 mol%.
  • the ratio of the homopolyester and the copolyester is such that the ratio of the copolymerizable monomer is 0.1 to
  • the range is about 30 mol% (preferably 1 to 25 mol%, more preferably 5 to 25 mol%), and the mass ratio of homopolyester / copolyester is usually 99/1 to 1/99, preferably It can be selected from the range of about 95/5 to 5/95, more preferably about 90/10 to 10/90.
  • the polybutylene terephthalate resin is obtained by copolymerizing terephthalic acid or a reactive derivative thereof and 1,4-butanediol with a monomer that can be copolymerized as necessary by a conventional method such as transesterification or direct esterification. Can be manufactured.
  • the content of the polybutylene terephthalate resin can be 50% by mass or more and less than 100% by mass in the total resin composition, preferably 60% by mass or more and less than 100% by mass, and more preferably 65% by mass. It can be set to mass% or more and 99.9 mass% or less.
  • the laser light transmission improving agent is an inorganic material having an action of improving the laser light transmission of the polybutylene terephthalate resin composition which is an opaque resin. Since the transmittance of the laser light of the resin composition is increased, a molded product manufactured using the resin composition can be used as a transmission-side molded product for laser welding.
  • the laser light transmission improver contains a layered silicate mineral.
  • the laser light transmission improver can also be configured to be a layered silicate mineral.
  • Layered silicate minerals are usually often used as inorganic fillers to improve the mechanical properties of the resulting molded body. Resins containing inorganic fillers are light transmissive due to light scattering. Is known to decrease.
  • the present inventors' research has newly revealed that a layered silicate mineral having a predetermined particle size has an effect of improving the laser light transmittance of a polybutylene terephthalate resin. Therefore, in this embodiment, a layered silicate mineral having a predetermined particle size is used as a laser light transmission improver.
  • the layered silicate mineral is a layered mineral composed of at least a metal oxide component and a SiO 2 component.
  • layered silicate minerals include talc, mica, kaolin, pyrophyllite, sericite, vermiculite, smectite, bentonite, stevensite, montmorillonite, beidellite, saponite, hectorite, nontronite and the like. , One or more selected from these can be used. Of these, talc is preferable.
  • the layered silicate mineral may be treated or untreated.
  • an artificial synthetic product corresponding to a natural product can also be used.
  • silicate minerals obtained from various synthetic methods using conventionally known various methods such as solid reaction, hydrothermal reaction, and ultrahigh pressure reaction can be used.
  • the average primary particle diameter of the layered silicate mineral is 1.0 ⁇ m or more and 5.0 ⁇ m or less.
  • the average primary particle diameter is preferably 1.5 ⁇ m or more and less than 5.0 ⁇ m, more preferably 2.0 ⁇ m or more or more than 2.0 ⁇ m, or less than 4.0 ⁇ m or less than 4.0 ⁇ m.
  • the “average primary particle size” is a value calculated by weighted average of the layered silicate mineral before blended with the resin composition by analyzing an image taken with a CCD camera. For example, it can be calculated using a dynamic image analysis method / particle (state) analyzer PITA-3 manufactured by Seishin Corporation.
  • the aspect ratio of the layered silicate mineral is not particularly limited, and can be, for example, 1 or more and 10 or less.
  • the content of the laser light transmission improver is preferably 0.01 parts by mass or more and 20 parts by mass or less with respect to 100 parts by mass of the polybutylene terephthalate resin. More preferably, they are 0.5 mass part or more and 15 mass parts or less, More preferably, they are 1.0 mass part or more and less than 15 mass parts. A lower limit can also be 5.0 mass parts or more.
  • the content of the layered silicate mineral is in the range of 0.01 parts by mass or more and 20 parts by mass or less, the laser light transmittance of the polybutylene terephthalate resin can be further improved.
  • a molded article using a polybutylene terephthalate resin composition having a layered silicate mineral content of 0.01 parts by mass or more can reduce variations in laser light transmittance in the molded article.
  • the resin composition of the present embodiment may contain an inorganic filler for the purpose of improving the mechanical properties of the obtained molded product.
  • an inorganic filler a fibrous filler, a plate-like filler, or a granular filler can be mentioned.
  • fibrous filler examples include glass fiber, asbestos fiber, carbon fiber, silica fiber, alumina fiber, silica-alumina fiber, aluminum silicate fiber, zirconia fiber, potassium titanate fiber, silicon carbide fiber, whisker (silicon carbide, Inorganic fibers such as whiskers such as alumina and silicon nitride); organic fibers such as aliphatic or aromatic polyamides, aromatic polyesters, acrylic resins such as fluororesin and polyacrylonitrile, fibers formed of rayon, etc.
  • whisker silicon carbide, Inorganic fibers such as whiskers such as alumina and silicon nitride
  • organic fibers such as aliphatic or aromatic polyamides, aromatic polyesters, acrylic resins such as fluororesin and polyacrylonitrile, fibers formed of rayon, etc.
  • the plate-like filler examples include talc, mica, glass flake, and graphite.
  • particulate filler examples include glass beads, glass powder, milled fiber (for example, milled glass fiber), wollastonite (wollastonite), and the like.
  • the wollastonite may be in the form of a plate, column, fiber, or the like.
  • glass fiber is preferable because it is inexpensive and easily available.
  • the average diameter of the fibrous filler is, for example, about 1 ⁇ m to 30 ⁇ m (preferably 3 ⁇ m to 20 ⁇ m), and the average length is, for example, about 100 ⁇ m to 5 mm (preferably 300 ⁇ m to 4 mm, more preferably 500 ⁇ m to 3.5 mm). There may be. Further, the average primary particle diameter of the plate-like or granular filler can be, for example, about 10 ⁇ m to 500 ⁇ m, preferably about 15 ⁇ m to 100 ⁇ m. These inorganic fillers can be used alone or in combination of two or more.
  • the average diameter and average length of the fibrous filler and the average primary particle diameter of the plate-like or powdery filler are the fibrous filler, plate-like or powdery filler before being mixed in the resin composition. Is a value calculated by analyzing an image photographed with a CCD camera and calculating a weighted average, and can be calculated using a device similar to the device used in the measurement of the average primary particle diameter of the layered silicate mineral.
  • the content of the inorganic filler is 5 parts by mass or more and 100 parts by mass or less, preferably 10 parts by mass or more and 80 parts by mass or less, more preferably 15 parts by mass or more and 60 parts by mass with respect to 100 parts by mass of the polybutylene terephthalate resin. It can be as follows. By setting it within this numerical range, it is possible to improve the mechanical properties and dimensional accuracy of the obtained molded product while maintaining the action of the above-described laser light transmission improving agent.
  • additives Various additives such as stabilizers (antioxidants, ultraviolet absorbers, heat stabilizers, etc.), flame retardants, lubricants, mold release agents, antistatic agents, coloring agents such as dyes and pigments, You may add a dispersing agent, a plasticizer, a nucleating agent, etc.
  • the content of the additive can be, for example, more than 0 parts by mass and 20 parts by mass or less with respect to 100 parts by mass of the polybutylene terephthalate resin.
  • the colorant if it is necessary to color the same color as the laser light absorption side molded product, in particular, black, due to the requirement of the design surface, a dye-based colorant so as not to impair the laser light transmittance. Or a pigment that does not impair the laser light transmittance (for example, BASF Lummogen Black) is desirable.
  • the resin composition can also contain other resins (thermoplastic resin, thermosetting resin, etc.) as necessary.
  • other resins include olefin elastomers, styrene elastomers, polyester elastomers, and core-shell polymers.
  • the polybutylene terephthalate resin composition of the present embodiment contains a laser light transmission improver, it has a laser light transmission property without adding a highly transparent resin as an alloy material. Therefore, the resin composition can be configured not to contain an alloy material. On the other hand, an alloy material can also be added in order to further enhance the laser light transmittance of the resin composition.
  • the alloy material include a polycarbonate resin, a polyethylene terephthalate resin, and a styrene resin.
  • the content thereof can be made lower than the amount added to the conventional PBT resin composition. For example, the content exceeds 0 part by mass with respect to 100 parts by mass of the polybutylene terephthalate resin. It can be below mass parts (for example, 20 mass parts).
  • the resin composition of the present embodiment may be a powder mixture or a molten mixture (pellets or the like).
  • a molded article formed using this resin composition has a higher laser beam transmittance than a molded article formed using a polybutylene terephthalate-based resin composition that does not contain a laser beam transmission improver. Therefore, the resin composition is suitable for producing a molded product for laser welding. In particular, it is suitable for manufacturing a laser light transmission side molded product.
  • the molded product can be formed using the above-described resin composition, and includes the above-described resin composition.
  • This molded product has a higher laser light transmittance at a wavelength of 800 nm to 1000 nm at an optical path length of 1.5 mm than a molded product formed using a polybutylene terephthalate resin composition that does not contain a laser light transmission improver.
  • the laser light transmittance is, for example, 20% of the laser light transmittance at a wavelength of 800 nm to 1000 nm in a molded product of 80 mm long ⁇ 80 mm wide ⁇ 1.5 mm thick (side gate, gate width 2 mm) formed by injection molding. For example, it is 23% or more.
  • the laser light transmittance is a value measured using a spectrophotometer.
  • the molded product can be obtained by molding the resin composition by a conventional method. For example, (1) A method in which each component is mixed, kneaded by a single or twin screw extruder and extruded to prepare pellets, and then molded. (2) A pellet (master batch) having a different composition is once prepared. The pellets can be mixed (diluted) in a predetermined amount and subjected to molding to obtain a molded product having a predetermined composition, or (3) a method in which one or more of each component is directly charged into a molding machine.
  • the pellets may be prepared by, for example, melting and mixing components excluding brittle components (such as glass-based reinforcing materials) and then mixing brittle components (such as glass-based reinforcing materials).
  • molding method conventional methods such as extrusion molding, injection molding, compression molding, blow molding, vacuum molding, rotational molding, gas injection molding, etc. can be used, but usually molding is performed by injection molding.
  • the shape of the molded product is not particularly limited, but since the molded product is used by joining with a mating material (other resin molded product) by laser welding, it usually has a shape having at least a contact surface (such as a flat surface) (for example, a plate shape) ).
  • the molded article of the present invention has high permeability to the laser beam, the thickness of the molded article (the thickness in the direction in which the laser beam is transmitted) at the site where the laser beam is transmitted can be selected from a wide range. It may be about 3 mm to 5 mm, preferably about 0.5 mm to 3 mm (for example, 1 mm to 2 mm).
  • the molded product is excellent in laser weldability, it is usually preferable to weld the resin molded product of the counterpart material by laser welding, but if necessary, other thermal welding methods, for example, vibration welding method, It can also be welded to other resin molded products by ultrasonic welding, hot plate welding, or the like.
  • the composite molded article includes a first molded article formed using a polybutylene terephthalate resin composition and including the resin composition, and a second molded article formed using the thermoplastic resin composition and including the thermoplastic resin composition.
  • the molded article is a laser-welded composite molded article.
  • the first molded product and the second molded product are joined and integrated by laser welding.
  • the composite molded article is formed by superimposing at least a part of the first molded article containing the polybutylene terephthalate resin composition and at least a part of the second molded article containing the thermoplastic resin composition.
  • the interface between the first molded product and the second molded product is at least partially melted to bring the joining surface into close contact, and then the two molded products are joined by cooling. It can be integrated into one composite molded body.
  • the thermoplastic resin composition constituting the second molded product is not particularly limited as long as it is a resin composition compatible with the polybutylene terephthalate resin, and examples thereof include olefin resins, vinyl resins, and styrene resins.
  • the resin composition include a resin, an acrylic resin, a polyester resin, a polyamide resin, and a polycarbonate resin.
  • the same type or the same type of resins as those constituting the polybutylene terephthalate resin aromatic polyester resins such as PBT resins and PET resins
  • polycarbonate resins or compositions thereof You may comprise material.
  • the first molded body may be formed of the polybutylene terephthalate resin composition of the present embodiment
  • the second molded body may be formed of a polybutylene terephthalate resin that does not contain a laser light transmission improver. .
  • the second molded product may contain an absorber or a colorant for laser light.
  • the colorant can be selected according to the wavelength of the laser beam, and an inorganic pigment or an organic pigment can be used.
  • Inorganic pigments include black pigments such as carbon black (for example, acetylene black, lamp black, thermal black, furnace black, channel black, ketjen black), red pigments such as iron oxide red, and orange pigments such as molybdate orange. And white pigments such as titanium oxide.
  • the organic pigment include a yellow pigment, an orange pigment, a red pigment, a blue pigment, and a green pigment.
  • These absorbents can be used alone or in combination of two or more.
  • black pigments or dyes, particularly carbon black can be used.
  • the average particle size of carbon black may be usually about 1 nm to 1000 nm, preferably about 10 nm to 100 nm.
  • the ratio of the colorant is 0.1% by mass to 10% by mass, preferably 0.5% by mass to 5% by mass (for example, 0.5% by mass to 3% by mass) with respect to the entire composition constituting the second molded article. Mass%).
  • Irradiation with laser light is usually performed from the first molded body side toward the second molded body, and heat is generated at the interface of the second molded body having light absorption, thereby the first molded body. And the second molded body are fused. If necessary, a lens system may be used to focus the laser beam on the interface between the first molded product and the second molded product and fuse the contact interface.
  • the laser light source is not particularly limited, and for example, a dye laser, a gas laser (excimer laser, argon laser, krypton laser, helium-neon laser, etc.), a solid laser (YAG laser, etc.), a semiconductor laser, and the like can be used. As the laser light, a pulse laser is usually used.
  • the composite molded product obtained in the present embodiment has high welding strength and little damage to the PBT resin due to laser light irradiation. Therefore, various applications such as electrical / electronic parts, office automate (OA) equipment parts, etc. It can be applied to home appliance parts, machine mechanism parts, automobile mechanism parts and the like. In particular, it can be suitably used for automobile electrical parts (various control units, ignition coil parts, etc.), motor parts, various sensor parts, connector parts, switch parts, relay parts, coil parts, transformer parts, lamp parts, and the like.
  • OA office automate
  • the method for improving the laser light transmittance of a polybutylene terephthalate resin composition is that a layered silicate mineral having an average primary particle diameter of 1.0 ⁇ m or more and 5.0 ⁇ m or less is blended with a polybutylene terephthalate resin composition. is there. Thereby, the laser beam transmittance of the polybutylene terephthalate resin composition can be improved, and the polybutylene terephthalate resin composition can be used for the production of a transmission side molded product used for laser welding.
  • the polybutylene terephthalate-based resin composition containing a layered silicate mineral having a predetermined particle size does not contain a layered silicate mineral, as shown in Examples described later.
  • the laser light transmittance was improved as compared with the case where a layered silicate mineral having a particle size outside the predetermined range was contained.
  • the type and content of the layered silicate mineral and the preferable range of the particle diameter are as described above, and are not described here.
  • Examples 1 to 4 Comparative Examples 1 to 4
  • pellets were produced by kneading at 250 ° C. with a twin-screw extruder (manufactured by Nippon Steel Works, 30 mm ⁇ ) at the content ratios shown in Tables 1 and 2.
  • the average primary particle diameter of talc was measured using a dynamic image analysis method / particle (state) analyzer PITA-3 manufactured by Seishin Enterprise Co., Ltd.
  • Polybutylene terephthalate resin PBT having an intrinsic viscosity of 0.95 dl / g, manufactured by Wintech Polymer Co., Ltd.
  • Talc 1 Talc with an average primary particle size of 2.6 ⁇ m
  • Talc 2 Talc with an average primary particle size of 3.4 ⁇ m
  • Talc 3 Talc with an average primary particle size of 6.2 ⁇ m
  • Talc 4 Talc glass fibers with an average primary particle size of 0.6 ⁇ m (GF): manufactured by Nippon Electric Glass Co., Ltd., trade name “ECS03T-187”, average diameter 13 ⁇ m, average length 3 mm
  • the molded articles formed using the resin compositions of Examples 1 to 4 were those of Comparative Example 1 formed using a resin composition containing no layered silicate mineral.
  • the laser light transmittance was improved as compared with the molded products of Comparative Examples 2 to 4 formed using a molded product and a resin composition containing a layered silicate mineral having a particle size outside the predetermined range.
  • This molded article has a laser light transmittance of a wavelength of 800 nm to 1000 nm as high as 23% or more, and is useful for producing a transmission side molded article at the time of laser welding.

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  • Chemical Kinetics & Catalysis (AREA)
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  • Polymers & Plastics (AREA)
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Abstract

La présente invention vise à fournir une composition de résine de poly(téréphtalate de butylène) pour soudage au laser, et un produit moulé. À cet effet, l'invention concerne une composition de résine de poly(téréphtalate de butylène) pour soudage au laser, contenant: une résine de poly(téréphtalate de butylène); et un agent d'amélioration de la transmissivité de lumière laser comprenant un silicate minéral stratifié ayant une taille moyenne des particules primaires de 1,0 µm à 5,0 µm. La quantité d'agent d'amélioration de la transmissivité de lumière laser contenue est de préférence de 0,01 parties en masse à 20 parties en masse par rapport à 100 parties en masse de résine de poly(téréphtalate de butylène).
PCT/JP2017/020642 2016-07-15 2017-06-02 Composition de résine pour soudage au laser, produit moulé, produit moulé composite et son procédé de production, et procédé pour améliorer la transmissivité de la lumière laser Ceased WO2018012138A1 (fr)

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WO2020218149A1 (fr) * 2019-04-25 2020-10-29 ポリプラスチックス株式会社 Composition de résine de poly(butylène téréphtalate) pour soudage au laser
WO2023145756A1 (fr) * 2022-01-31 2023-08-03 ポリプラスチックス株式会社 Composition de résine pour soudage au laser, article moulé composite et procédé d'amélioration de la transmittance de faisceau laser d'une composition de résine

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