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CN116200010A - Polyester composition and preparation method and application thereof - Google Patents

Polyester composition and preparation method and application thereof Download PDF

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Publication number
CN116200010A
CN116200010A CN202211707007.8A CN202211707007A CN116200010A CN 116200010 A CN116200010 A CN 116200010A CN 202211707007 A CN202211707007 A CN 202211707007A CN 116200010 A CN116200010 A CN 116200010A
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China
Prior art keywords
polyester composition
acid
resin
plasticizer
phosphate
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Chinese (zh)
Inventor
林立
张超
刘纪庆
叶士兵
王飞
肖军华
付大炯
安朋
方冲
张永
杨霄云
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Shanghai Kingfa Science and Technology Co Ltd
Jiangsu Kingfa New Material Co Ltd
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Shanghai Kingfa Science and Technology Co Ltd
Jiangsu Kingfa New Material Co Ltd
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Priority to CN202211707007.8A priority Critical patent/CN116200010A/en
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    • CCHEMISTRY; METALLURGY
    • C08ORGANIC MACROMOLECULAR COMPOUNDS; THEIR PREPARATION OR CHEMICAL WORKING-UP; COMPOSITIONS BASED THEREON
    • C08LCOMPOSITIONS OF MACROMOLECULAR COMPOUNDS
    • C08L67/00Compositions of polyesters obtained by reactions forming a carboxylic ester link in the main chain; Compositions of derivatives of such polymers
    • C08L67/02Polyesters derived from dicarboxylic acids and dihydroxy compounds
    • CCHEMISTRY; METALLURGY
    • C08ORGANIC MACROMOLECULAR COMPOUNDS; THEIR PREPARATION OR CHEMICAL WORKING-UP; COMPOSITIONS BASED THEREON
    • C08LCOMPOSITIONS OF MACROMOLECULAR COMPOUNDS
    • C08L2205/00Polymer mixtures characterised by other features
    • C08L2205/08Polymer mixtures characterised by other features containing additives to improve the compatibility between two polymers

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  • Chemical & Material Sciences (AREA)
  • Health & Medical Sciences (AREA)
  • Chemical Kinetics & Catalysis (AREA)
  • Medicinal Chemistry (AREA)
  • Polymers & Plastics (AREA)
  • Organic Chemistry (AREA)
  • Compositions Of Macromolecular Compounds (AREA)

Abstract

The invention relates to a polyester composition, a preparation method and application thereof, and the components comprise: PBT resin, compound resin flat glass fiber, ester plasticizer, carbonate and other auxiliary agents. The polyester composition can simultaneously meet the conditions that the retention rate of tensile strength performance is more than or equal to 60%, the retention rate of unnotched impact strength performance is more than or equal to 40% and the laser transmittance of a sample wafer of 2.5mm is more than or equal to 30% under the condition of soaking in 10% NaOH solution at 60 ℃ for 200 hours, and is particularly suitable for the fields of automobiles and electronic appliances.

Description

Polyester composition and preparation method and application thereof
Technical Field
The invention belongs to the field of engineering plastics, and particularly relates to a polyester composition, and a preparation method and application thereof.
Background
Polybutylene terephthalate (PBT) is widely used in fields of automobiles, electronics and electricity, construction, etc., due to its excellent mechanical strength, solvent resistance, abrasion resistance, electrical insulation, dimensional stability, etc. For example, in the automotive field, connectors, dispensers, ignition coils, sensors, control units, etc.; it is used for connectors, switching elements, relays, coil components, etc. in the field of electronics and electrical. The concrete embedded bolt can be used for sanitary parts and concrete embedded bolts in the field of construction. Among them, some plastic parts having complicated structures and shapes cannot be formed at one time, and an adhesive, screw fixation, snap-fit, hot plate welding, ultrasonic welding, etc. are required to join a plurality of formed parts.
Compared with the traditional plastic welding process, the laser welding is an efficient and precise welding method which uses a laser beam with high energy density as a heat source, and the rapid temperature rise and reduction rate can greatly reduce the vibration stress and the thermal stress of the product; in addition, the welding process of laser welding is stable, the surface and the internal quality of the welding seam are very good, the welding can be performed in vacuum, air or other gas environments, the requirement on a welding medium is not high, and the welding can be performed through glass or other materials transparent to light beams. Because of its unique advantages, laser welding is used more and more frequently in applications requiring secondary fusion processes.
However, polyester resins have relatively low laser permeability as semi-crystalline resins as compared with amorphous resins such as polycarbonate resins and polystyrene resins, and thus have a narrow window of processing conditions, and it is necessary to increase laser power or irradiation rate at the time of welding or to reduce the thickness of molded articles of laser-irradiated portions so as to achieve good joining effects. However, increasing the laser power or irradiation rate may cause burning whitening of the material surface with a decrease in weld strength. There are various known methods for improving the laser transparency of PBT. Laser transparent polyesters are disclosed in, for example, CN102892819B, which relates to thermoplastic molded bodies for the production of laser transparent molded parts, said thermoplastic molded bodies comprising as main components by adding Na 2 CO 3 、K 2 CO 3 、NaHCO 3 、KHCO 3 Although the alkaline substances can improve the laser transmittance of the PBT material, the ester groups of the material are easy to accelerate hydrolysis under alkaline conditions, so that the material is rapidly degraded and cannot meet the use requirements. Even worse, the materials may also be used in alkaline environments such as snow-melting agents, toilet cleaners, bathroom cleaners, bleaches, cements, and the like. The prior art can not meet the requirements of alkali resistance and higher light transmittance.
Disclosure of Invention
Aiming at the defects of the prior art, the invention aims to provide a polyester composition, and a preparation method and application thereof.
The invention relates to a polyester composition, which comprises the following components in parts by weight:
Figure SMS_1
wherein the compound resin is styrene-acrylonitrile SAN resin and styrene-maleic anhydride SMA resin, and the mass ratio of the SAN resin to the SMA resin is (3-6): 1.
The concentration of carboxyl end groups of the PBT resin is not more than 15mol/t.
Further, the concentration of the carboxyl end groups of the PBT resin is 0.01-15mol/t.
Preferably, the mass ratio of the SAN resin to the SMA resin is (4-5): 1.
the mass ratio of the SAN resin to the SMA resin is optimized, so that the polyester composition has better laser permeability and mechanical property retention rate.
The aspect ratio of the cross section of the flat glass fiber is 2-6:1.
the ester plasticizer is at least one of a diester plasticizer and a triester plasticizer.
Preferably, the diester plasticizer is a diester plasticizer formed by at least one acid selected from phthalic acid, terephthalic acid, adipic acid, maleic acid, azelaic acid, sebacic acid, and anhydrides thereof, and at least one alcohol selected from aliphatic alcohols, alicyclic alcohols, and aromatic alcohols.
Further preferably, the diester-based plasticizer is one or more of butyl benzyl phthalate, dilauryl phthalate, bisundecyl phthalate, diheptyl phthalate, dicyclohexyl phthalate, diisodecyl phthalate, dioctyl adipate, diisodecyl adipate, di (butoxyethyl) adipate, bis-2-ethylhexyl azelate, bis-2-ethylhexyl maleate, dibutyl maleate, dioctyl sebacate, dibutyl sebacate.
Preferably, the triester plasticizer is a triester plasticizer formed by at least one acid selected from citric acid, trimellitic acid, phosphoric acid and anhydrides thereof and at least one alcohol selected from aliphatic alcohol, alicyclic alcohol and aromatic alcohol.
Further preferably, the triester plasticizer is one or more of triethyl citrate, tributyl citrate, trioctyl citrate, tributyl trimellitate, tri (2-ethylhexyl) trimellitate, tricresyl phosphate, tri (isopropylphenyl) phosphate, trioctyl phosphate, tri (butoxyethyl) phosphate, tri (beta-chloropropyl) phosphate, triphenyl phosphate, and octyl diphenyl phosphate.
Preferably, the carbonate is one or more of sodium carbonate, sodium bicarbonate, potassium carbonate and potassium bicarbonate.
Preferably, the polyester composition also contains 0.5 to 5 parts of other auxiliary agents, wherein the other auxiliary agents are one or more of light stabilizer, antioxidant and lubricant.
Further, 0.6-2 parts of other auxiliary agents.
Further, the light stabilizers include, but are not limited to, the Cyasorb UV-3346 light stabilizer, the Uvinul4050H light stabilizer, the Tinuvin622 light stabilizer, and the Chimassor b944 light stabilizer.
Further, the lubricant includes, but is not limited to, one or more of silicone, oxidized polyolefin wax, hyperbranched polyester, aliphatic fatty acid ester, or ethylene-acrylic acid copolymer.
Further, the antioxidant includes, but is not limited to, any one or more of N, N' -bis- (3, 5-di-tert-butyl-4-hydroxyphenyl) propionyl) hexamethylenediamine (antioxidant 1098), tris [2, 4-di-tert-butylphenyl ] phosphite (antioxidant 168), tetrakis [ beta- (3, 5-di-tert-butyl-4-hydroxyphenyl) propionate ] pentaerythritol ester (antioxidant 1010), bis (2, 4-dicumylphenyl) pentaerythritol diphosphite (antioxidant S9228) or phosphite antioxidants.
Preferably, the components comprise, by weight:
Figure SMS_2
the preparation method of the polyester composition comprises the following steps:
weighing the components according to the proportion, uniformly mixing, adding into a double-screw extruder, melting, mixing, extruding and granulating to obtain the polyester composition.
Preferably, the extrusion granulation temperature is 220-280 ℃.
One of the polyester compositions of the present invention is used in automobiles or electronic appliances, such as ignition coils, electrical control boxes, sensors, connectors, and the like.
According to the polyester composition, the compound resin SAN resin and the SMA resin are added into the PBT, so that on one hand, the SMA resin improves the compatibility of a PBT phase and a SAN phase, reduces the two-phase size, is beneficial to obtaining good laser transmission, and meanwhile, the alkali resistance of a system is improved due to the introduction of a benzene ring; on the other hand, the maleic anhydride group of the SMA can react with the terminal carboxyl group of the PBT, so that the rupture of the ester group in an alkaline environment is slowed down, and meanwhile, the ester plasticizer plays a role in improving alkali resistance, so that an alkaline solution in the external environment can be prevented from entering, a matrix is effectively protected, the deterioration of the mechanical property of the material caused by carbonate serving as a laser transmission improving agent is eliminated, and the alkali resistance of the material is greatly improved compared with the traditional polycarbodiimide hydrolysis resisting agent.
Advantageous effects
The polyester composition can simultaneously meet the conditions that the retention rate of tensile strength performance is more than or equal to 60%, the retention rate of unnotched impact strength performance is more than or equal to 40% and the laser transmittance of a sample wafer of 2.5mm is more than or equal to 30% under the condition of soaking in 10% NaOH solution at 60 ℃ for 200 hours, and is particularly suitable for the fields of automobiles and electronic appliances.
Detailed Description
The invention will be further illustrated with reference to specific examples. It is to be understood that these examples are illustrative of the present invention and are not intended to limit the scope of the present invention. Further, it is understood that various changes and modifications may be made by those skilled in the art after reading the teachings of the present invention, and such equivalents are intended to fall within the scope of the claims appended hereto.
1. The raw material sources are as follows:
PBT resin: PBT GX121J, ceremony petrochemical industry, carboxyl end group concentration of 9mol/t
Flat glass fiber: glass fiber TFG-3.0-T436, aspect ratio of cross section 4:1, a step of; shandong Taishan glass fiber Co., ltd;
SAN resin: SAN NF2200AK taiwan platform company (taiwan region corporation of china);
SMA resin: SMA-725K, jiaxing Hua chemical Co., ltd;
PTW ethylene-acrylate-glycidyl methacrylate, duPont;
ester plasticizer-1: trioctyl citrate, a western reagent;
ester plasticizer-2: diundecyl phthalate, beijing Olympic pharmaceutical technology Co
Ester plasticizer-3: dioctyl adipate, shandong chemical Co., ltd
Hydrolysis resistance agent: polycarbodiimide Stabaxol P400, rhine chemical Co., germany
Carbonate: sodium carbonate: ara Ding Shiji
Other auxiliaries: the mass ratio of the antioxidant 1098 to the antioxidant 168 is 1:1;
compounding resin-1: the mass ratio of SAN resin to SMA resin is 4:1;
compounding resin-2: the mass ratio of SAN resin to SMA resin is 5:1;
compounding resin-3: the mass ratio of SAN resin to SMA resin is 3:1;
compounding resin-4: the mass ratio of SAN resin to SMA resin is 6:1;
compounding resin-5: the mass ratio of SAN resin to SMA resin is 1:1;
compounding resin-6: the mass ratio of SAN resin to SMA resin is 8:1;
compounding resin-7: the mass ratio of SAN resin to PTW resin is 4:1;
the sodium carbonate and other adjuvants used in the parallel examples and comparative examples are all the same commercial products.
2. Preparation methods of examples and comparative examples
Weighing the components according to the proportion, uniformly mixing, adding into a double-screw extruder, melting, mixing, extruding and granulating to obtain the polyester composition. The extrusion granulating temperature is 220-280 ℃.
3. Test criteria and methods
Mechanical property test:
tensile strength: the tensile rate was 10mm/min according to ISO527-2-2012, test conditions: 23 ℃,50% rh;
non notched impact strength: spline dimensions 80mm x 10mm x 4mm, test conditions according to ISO 179-1-2010: 23 ℃,50% rh.
Alkali resistance experiment: and placing the injection molded tensile sample bar and the non-notch impact strength sample bar in a 10% NaOH solution with mass percent concentration, soaking at 60 ℃ for 200 hours, taking out, placing in a 23 ℃/50% RH environment for 24 hours, performing mechanical property test, and comparing with the original performance, calculating the performance retention rate.
The performance retention rate calculation method comprises the following steps: px/P0×100%, wherein P0 is initial mechanical property, and Px is mechanical property after alkali resistance experiment treatment.
Laser transmittance test:
a80 mm by 50mm by 2mm template (thickness 2 mm) was molded separately using an injection molding machine, with a cylinder temperature of 280℃and a mold temperature of 120 ℃. The transmittance at 1064nm was measured by measuring the transmittance at the center of the sample plate using a near infrared spectrometer (wavelength 900-1700nm, NIRQUest spectrometer, ocean optics).
Table 1 shows the proportions (parts by weight) of the examples
Figure SMS_3
Table 2 example formulation (parts by weight)
Figure SMS_4
Figure SMS_5
Table 3 comparative examples ratio (parts by weight)
Figure SMS_6
Table 4 shows example performance effect data
Figure SMS_7
Table 5 example performance effect data
Figure SMS_8
Figure SMS_9
Table 6 comparative example performance effect data
Figure SMS_10
Examples 1, 11-13 and comparative examples 1-5, 7, 8 and 12 show that the requirements of the tensile strength performance retention of more than or equal to 60%, the performance retention of the unnotched impact strength of more than or equal to 40% and the laser transmittance of a 2mm sample wafer of more than or equal to 30% can be met only by compounding SAN resin and SMA resin in a specific range and fixing the content of the ester plasticizer.
Example 1 and comparative examples 6 and 11 show that the ester plasticizer can greatly improve the alkali resistance of the material and has less negative effect on the laser transmittance compared with the traditional hydrolysis resistance agent.
Examples 1, 14-16 and comparative examples 9-10 show that the ratio of the compound resin is fixed, and the ratio of the ester plasticizer can meet the requirements that the tensile strength performance retention rate is more than or equal to 60%, the performance retention rate of the unnotched impact strength is more than or equal to 40% and the laser transmittance of a 2mm sample wafer is more than or equal to 30% only by 0.5-6 parts.
Examples 1-16 and comparative examples 6 and 12 show that the compound resin and the ester plasticizer in the system need to exist simultaneously and the proportion is within a specific range to simultaneously meet the requirements that the tensile strength performance retention rate is more than or equal to 60%, the performance retention rate of the unnotched impact strength is more than or equal to 40% and the laser transmittance of the 2mm sample wafer is more than or equal to 30%.

Claims (10)

1. The polyester composition is characterized by comprising the following components in parts by weight:
Figure FDA0004025078720000011
wherein the compound resin is SAN resin and SMA resin, and the mass ratio of the SAN resin to the SMA resin is (3-6): 1.
2. The polyester composition of claim 1, wherein the PBT resin has a carboxyl end group concentration of not more than 15mol/t.
3. The polyester composition of claim 1, wherein the mass ratio of SAN resin to SMA resin is (4-5): 1.
4. The polyester composition of claim 1, wherein the flat glass fiber has a cross-sectional aspect ratio of 2 to 6:1, a step of; the carbonate is one or more of sodium carbonate, sodium bicarbonate, potassium carbonate and potassium bicarbonate.
5. The polyester composition of claim 1, wherein the ester plasticizer is at least one of a diester-based plasticizer or a triester-based plasticizer;
the diester plasticizer is a diester plasticizer formed by at least one acid selected from phthalic acid, terephthalic acid, adipic acid, maleic acid, azelaic acid, sebacic acid and anhydrides thereof and at least one alcohol selected from aliphatic alcohol, alicyclic alcohol and aromatic alcohol;
the triester plasticizer is a triester plasticizer formed by at least one acid selected from citric acid, trimellitic acid, phosphoric acid and anhydrides thereof and at least one alcohol selected from aliphatic alcohol, alicyclic alcohol and aromatic alcohol.
6. The polyester composition according to claim 5, wherein the diester-based plasticizer is one or more of butylbenzyl phthalate, bisundecyl phthalate, dilauryl phthalate, diheptyl phthalate, dicyclohexyl phthalate, diisodecyl phthalate, dioctyl adipate, diisodecyl adipate, di (butoxyethyl) adipate, bis-2-ethylhexyl azelate, bis-2-ethylhexyl maleate, dibutyl maleate, dioctyl sebacate, dibutyl sebacate;
the triester plasticizer is one or more of triethyl citrate, tributyl citrate, trioctyl citrate, tributyl trimellitate, tri (2-ethylhexyl) trimellitate, tricresyl phosphate, tri (isopropylphenyl) phosphate, trioctyl phosphate, tri (butoxyethyl) phosphate, tri (beta-chloropropyl) phosphate, triphenyl phosphate and octyl diphenyl phosphate.
7. The polyester composition according to claim 1, wherein the polyester composition further comprises 0.5 to 5 parts of other auxiliary agents; wherein the other auxiliary agent is one or more of light stabilizer, antioxidant and lubricant.
8. The polyester composition of claim 1, wherein the components comprise, in parts by weight:
Figure FDA0004025078720000021
9. a process for preparing the polyester composition of claim 1 comprising:
weighing the components according to the proportion, mixing, adding into a double-screw extruder, melting, mixing, extruding and granulating to obtain the polyester composition.
10. Use of the polyester composition of claim 1 in the automotive and electrical fields.
CN202211707007.8A 2022-12-29 2022-12-29 Polyester composition and preparation method and application thereof Pending CN116200010A (en)

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Citations (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN102892819A (en) * 2010-05-18 2013-01-23 巴斯夫欧洲公司 Laser-transparent polyester
CN103724953A (en) * 2014-01-16 2014-04-16 厦门市天宇塑料工业有限公司 Special low-warpage flame-retardant reinforced PBT (polybutylene terephthalate) material for relay and application of material
CN110862655A (en) * 2019-12-11 2020-03-06 宁波华腾首研新材料有限公司 PBT/SAN composite material and preparation method and application thereof
CN114230953A (en) * 2021-12-17 2022-03-25 金发科技股份有限公司 Transparent resin composition with stable size and enhanced mechanics, preparation method and application thereof

Patent Citations (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN102892819A (en) * 2010-05-18 2013-01-23 巴斯夫欧洲公司 Laser-transparent polyester
CN103724953A (en) * 2014-01-16 2014-04-16 厦门市天宇塑料工业有限公司 Special low-warpage flame-retardant reinforced PBT (polybutylene terephthalate) material for relay and application of material
CN110862655A (en) * 2019-12-11 2020-03-06 宁波华腾首研新材料有限公司 PBT/SAN composite material and preparation method and application thereof
CN114230953A (en) * 2021-12-17 2022-03-25 金发科技股份有限公司 Transparent resin composition with stable size and enhanced mechanics, preparation method and application thereof

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