CN114672142B - PBT composition, and preparation method and application thereof - Google Patents
PBT composition, and preparation method and application thereof Download PDFInfo
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- CN114672142B CN114672142B CN202210334210.9A CN202210334210A CN114672142B CN 114672142 B CN114672142 B CN 114672142B CN 202210334210 A CN202210334210 A CN 202210334210A CN 114672142 B CN114672142 B CN 114672142B
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- 239000000203 mixture Substances 0.000 title claims abstract description 49
- 238000002360 preparation method Methods 0.000 title claims abstract description 9
- TZCXTZWJZNENPQ-UHFFFAOYSA-L barium sulfate Chemical compound [Ba+2].[O-]S([O-])(=O)=O TZCXTZWJZNENPQ-UHFFFAOYSA-L 0.000 claims abstract description 56
- 239000001509 sodium citrate Substances 0.000 claims abstract description 23
- NLJMYIDDQXHKNR-UHFFFAOYSA-K sodium citrate Chemical compound O.O.[Na+].[Na+].[Na+].[O-]C(=O)CC(O)(CC([O-])=O)C([O-])=O NLJMYIDDQXHKNR-UHFFFAOYSA-K 0.000 claims abstract description 23
- 238000003466 welding Methods 0.000 claims abstract description 23
- 239000003963 antioxidant agent Substances 0.000 claims abstract description 22
- 230000003078 antioxidant effect Effects 0.000 claims abstract description 15
- 239000011347 resin Substances 0.000 claims abstract description 15
- 229920005989 resin Polymers 0.000 claims abstract description 15
- 239000000314 lubricant Substances 0.000 claims abstract description 10
- 239000003365 glass fiber Substances 0.000 claims abstract description 9
- 239000002245 particle Substances 0.000 claims abstract description 7
- 239000004033 plastic Substances 0.000 claims abstract description 7
- 229920003023 plastic Polymers 0.000 claims abstract description 7
- 238000002156 mixing Methods 0.000 claims description 13
- 238000000034 method Methods 0.000 claims description 9
- 125000003178 carboxy group Chemical group [H]OC(*)=O 0.000 claims description 8
- 239000000243 solution Substances 0.000 claims description 7
- 239000000835 fiber Substances 0.000 claims description 6
- 239000011259 mixed solution Substances 0.000 claims description 6
- 230000008569 process Effects 0.000 claims description 6
- 239000005357 flat glass Substances 0.000 claims description 4
- 238000002844 melting Methods 0.000 claims description 2
- 230000008018 melting Effects 0.000 claims description 2
- 238000002834 transmittance Methods 0.000 abstract description 15
- 239000000463 material Substances 0.000 abstract description 13
- 238000004383 yellowing Methods 0.000 abstract description 2
- 229920001707 polybutylene terephthalate Polymers 0.000 description 54
- 230000000052 comparative effect Effects 0.000 description 12
- LYCAIKOWRPUZTN-UHFFFAOYSA-N Ethylene glycol Chemical compound OCCO LYCAIKOWRPUZTN-UHFFFAOYSA-N 0.000 description 6
- 238000002425 crystallisation Methods 0.000 description 6
- 230000008025 crystallization Effects 0.000 description 6
- 239000000126 substance Substances 0.000 description 6
- ISWSIDIOOBJBQZ-UHFFFAOYSA-N Phenol Chemical compound OC1=CC=CC=C1 ISWSIDIOOBJBQZ-UHFFFAOYSA-N 0.000 description 5
- OJMIONKXNSYLSR-UHFFFAOYSA-N phosphorous acid Chemical compound OP(O)O OJMIONKXNSYLSR-UHFFFAOYSA-N 0.000 description 5
- -1 polybutylene terephthalate Polymers 0.000 description 5
- 238000012360 testing method Methods 0.000 description 5
- ICKWICRCANNIBI-UHFFFAOYSA-N 2,4-di-tert-butylphenol Chemical compound CC(C)(C)C1=CC=C(O)C(C(C)(C)C)=C1 ICKWICRCANNIBI-UHFFFAOYSA-N 0.000 description 4
- 229920000642 polymer Polymers 0.000 description 4
- 239000002131 composite material Substances 0.000 description 3
- 230000006911 nucleation Effects 0.000 description 3
- 238000010899 nucleation Methods 0.000 description 3
- CTOIGOKFMHRTSR-UHFFFAOYSA-N 2-(3,5-ditert-butyl-4-hydroxyphenyl)-n-[6-[2-(3,5-ditert-butyl-4-hydroxyphenyl)propanoylamino]hexyl]propanamide Chemical compound C=1C(C(C)(C)C)=C(O)C(C(C)(C)C)=CC=1C(C)C(=O)NCCCCCCNC(=O)C(C)C1=CC(C(C)(C)C)=C(O)C(C(C)(C)C)=C1 CTOIGOKFMHRTSR-UHFFFAOYSA-N 0.000 description 2
- WPMYUUITDBHVQZ-UHFFFAOYSA-N 3-(3,5-ditert-butyl-4-hydroxyphenyl)propanoic acid Chemical compound CC(C)(C)C1=CC(CCC(O)=O)=CC(C(C)(C)C)=C1O WPMYUUITDBHVQZ-UHFFFAOYSA-N 0.000 description 2
- GYOZZWNPRKAISG-UHFFFAOYSA-N P(O)(O)O.C(C)(C)(C)C1=C(C(=CC(=C1)C(O)(C(CO)(CO)CO)C1=CC(=C(C(=C1)C(C)(C)C)C)C(C)(C)C)C(C)(C)C)C Chemical compound P(O)(O)O.C(C)(C)(C)C1=C(C(=CC(=C1)C(O)(C(CO)(CO)CO)C1=CC(=C(C(=C1)C(C)(C)C)C)C(C)(C)C)C(C)(C)C)C GYOZZWNPRKAISG-UHFFFAOYSA-N 0.000 description 2
- 239000004698 Polyethylene Substances 0.000 description 2
- KKEYFWRCBNTPAC-UHFFFAOYSA-N Terephthalic acid Chemical compound OC(=O)C1=CC=C(C(O)=O)C=C1 KKEYFWRCBNTPAC-UHFFFAOYSA-N 0.000 description 2
- 230000009286 beneficial effect Effects 0.000 description 2
- 229910017053 inorganic salt Inorganic materials 0.000 description 2
- 229910052751 metal Inorganic materials 0.000 description 2
- 239000002184 metal Substances 0.000 description 2
- 238000012986 modification Methods 0.000 description 2
- 230000004048 modification Effects 0.000 description 2
- 239000002667 nucleating agent Substances 0.000 description 2
- WXZMFSXDPGVJKK-UHFFFAOYSA-N pentaerythritol Chemical compound OCC(CO)(CO)CO WXZMFSXDPGVJKK-UHFFFAOYSA-N 0.000 description 2
- 229920000573 polyethylene Polymers 0.000 description 2
- 239000002861 polymer material Substances 0.000 description 2
- 125000003003 spiro group Chemical group 0.000 description 2
- 229910052623 talc Inorganic materials 0.000 description 2
- ZIBGPFATKBEMQZ-UHFFFAOYSA-N triethylene glycol Chemical compound OCCOCCOCCO ZIBGPFATKBEMQZ-UHFFFAOYSA-N 0.000 description 2
- 238000004026 adhesive bonding Methods 0.000 description 1
- 150000001408 amides Chemical class 0.000 description 1
- 125000000129 anionic group Chemical group 0.000 description 1
- 238000013459 approach Methods 0.000 description 1
- 230000005540 biological transmission Effects 0.000 description 1
- CDQSJQSWAWPGKG-UHFFFAOYSA-N butane-1,1-diol Chemical compound CCCC(O)O CDQSJQSWAWPGKG-UHFFFAOYSA-N 0.000 description 1
- 239000006229 carbon black Substances 0.000 description 1
- 239000003153 chemical reaction reagent Substances 0.000 description 1
- 238000004891 communication Methods 0.000 description 1
- 239000013078 crystal Substances 0.000 description 1
- 230000007547 defect Effects 0.000 description 1
- 238000011161 development Methods 0.000 description 1
- 230000000694 effects Effects 0.000 description 1
- 238000005516 engineering process Methods 0.000 description 1
- 230000007613 environmental effect Effects 0.000 description 1
- 230000002349 favourable effect Effects 0.000 description 1
- 238000009472 formulation Methods 0.000 description 1
- 230000006872 improvement Effects 0.000 description 1
- 238000002347 injection Methods 0.000 description 1
- 239000007924 injection Substances 0.000 description 1
- 238000001746 injection moulding Methods 0.000 description 1
- 230000031700 light absorption Effects 0.000 description 1
- 230000007246 mechanism Effects 0.000 description 1
- 239000004209 oxidized polyethylene wax Substances 0.000 description 1
- 235000013873 oxidized polyethylene wax Nutrition 0.000 description 1
- 238000011056 performance test Methods 0.000 description 1
- 238000006068 polycondensation reaction Methods 0.000 description 1
- 229920000728 polyester Polymers 0.000 description 1
- 239000002994 raw material Substances 0.000 description 1
- 230000000630 rising effect Effects 0.000 description 1
- 239000007858 starting material Substances 0.000 description 1
- 238000009864 tensile test Methods 0.000 description 1
- 238000004448 titration Methods 0.000 description 1
- 239000001993 wax Substances 0.000 description 1
Classifications
-
- C—CHEMISTRY; METALLURGY
- C08—ORGANIC MACROMOLECULAR COMPOUNDS; THEIR PREPARATION OR CHEMICAL WORKING-UP; COMPOSITIONS BASED THEREON
- C08L—COMPOSITIONS OF MACROMOLECULAR COMPOUNDS
- C08L67/00—Compositions of polyesters obtained by reactions forming a carboxylic ester link in the main chain; Compositions of derivatives of such polymers
- C08L67/02—Polyesters derived from dicarboxylic acids and dihydroxy compounds
-
- C—CHEMISTRY; METALLURGY
- C08—ORGANIC MACROMOLECULAR COMPOUNDS; THEIR PREPARATION OR CHEMICAL WORKING-UP; COMPOSITIONS BASED THEREON
- C08K—Use of inorganic or non-macromolecular organic substances as compounding ingredients
- C08K3/00—Use of inorganic substances as compounding ingredients
- C08K3/30—Sulfur-, selenium- or tellurium-containing compounds
- C08K2003/3045—Sulfates
Landscapes
- 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 provides a PBT composition, and a preparation method and application thereof. The PBT composition comprises the following components: PBT resin, glass fiber, barium sulfate, sodium citrate, lubricant and antioxidant; the average particle size of the barium sulfate is less than or equal to 4.5 mu m. According to the PBT composition, a proper amount of sodium citrate and barium sulfate are added into the PBT at the same time, so that the light transmittance of the PBT material is improved, and the yellowing of the material can be inhibited. The PBT composition can be used for preparing plastic products for laser welding.
Description
Technical Field
The invention relates to the technical field of high polymer materials, in particular to a PBT composition, and a preparation method and application thereof.
Background
PBT (polybutylene terephthalate) is a high molecular polymer obtained by polycondensation of terephthalic acid and butanediol, and the PBT has excellent physical and chemical properties, in particular excellent mechanical properties, heat resistance, chemical reagent resistance, dimensional stability and the like, and is widely applied to the fields of household appliances, electronic appliances, automobiles, rail transit and the like.
With the development of household appliances and electronic appliance industries and the increasing awareness of people on environmental protection, the traditional splicing process has obvious defects, such as rough welding seams and huge noise; the gluing process is not only inefficient but also pollutes the environment. The laser welding process that has been rising in recent years has significant advantages. Laser welding uses laser light with a certain wavelength, and the welding strength of the laser welding is related to the light transmittance of the target welding material, and in general, the higher the light transmittance of the target welding material is, the higher the welding strength is. But the light transmittance of the PBT material to laser is low, so that the application of the PBT material in laser welding is limited.
To solve the above problems, the prior art attempts to increase the transparency of PBT composites by adding a proportion of a better transparent polymer material, but this approach changes the material composition and the addition of polymers has some negative effects, such as compatibility problems of the material components. The prior art also discloses that the light transmittance of the polyester material is improved by adding the crystallization accelerator, and the method can improve the light transmittance of the PBT composite material without adding other polymers, so that the light transmittance of the whole material is improved, but the existing crystallization accelerators are mostly metal inorganic salt crystallization accelerators, and the metal inorganic salt crystallization accelerators can turn yellow the color of the PBT material.
Disclosure of Invention
The invention aims to provide a PBT composition, which adopts a mode of not adding other polymers to improve the light transmittance of a PBT composite material, has no yellowing of the color, and has higher whiteness.
It is another object of the present invention to provide a process for the preparation of the PBT composition.
It is a further object of the present invention to provide the use of the PBT composition.
In order to solve the technical problems, the invention adopts the following technical scheme:
the PBT composition comprises the following components in parts by weight:
the average particle size of the barium sulfate is less than or equal to 4.5 mu m.
In the PBT composition disclosed by the invention, sodium citrate can play a role of a crystallization promoter, and barium sulfate can play a role of a nucleating agent and can improve the whiteness of a material. The inventor finds that by adding sodium citrate and barium sulfate into PBT at the same time, the tiny barium sulfate can play a role of a nucleating agent to provide nucleation points, the nucleation mechanism is heterogeneous nucleation, the sodium citrate can form an anionic end group with the tail end of the PBT to promote the PBT to nucleate, the sodium citrate and the PBT are combined with the PBT to cooperate, the crystallization rate of the PBT is faster, and the formed crystals are smaller, so that the light transmittance of the prepared PBT composition is improved.
Preferably, the PBT composition comprises the following components in parts by weight:
preferably, the average particle diameter of the barium sulfate is 0.3-1.3 μm.
In the PBT composition disclosed by the invention, the lower concentration of the carboxyl end groups of the PBT resin is beneficial to further improving the light transmittance of the PBT composition. Preferably, the concentration of carboxyl end groups of the PBT resin is less than or equal to 5mol/t. Preferably, the concentration of carboxyl end groups of the PBT resin is less than or equal to 10mol/t. More preferably, the PBT resin has a carboxyl end group concentration of 5mol/t or less.
The terminal carboxyl group concentration of the PBT resin is obtained by testing according to a chemical titration method. Preferably, the mass ratio of the barium sulfate to the sodium citrate is (4-6): 1.
the glass fiber is flat glass fiber. The aspect ratio of the cross section of the flat glass fiber is more than or equal to 3:1.
the antioxidant is one or more of hindered phenol antioxidants and phosphite antioxidants.
The hindered phenol antioxidant is one or more of N, N' -hexamethylenebis (3, 5-di-tert-butyl-4-hydroxy-phenyl-propionamide), pentaerythritol tetra [1093,5-di-tert-butyl-4-hydroxy-phenyl) -propionate, triethylene glycol bis-3- (3-tert-butyl-4-hydroxy-5-methylphenyl) -propionate, beta- (4-hydroxy-3, 5-di-tert-butylphenyl) -propionate or spiro ethylene glycol bis [ beta- (3-tert-butyl-4-hydroxy-5-methylphenyl) -propionate ].
The phosphite antioxidant is one or more of 2, 4-di-tert-butylphenol and bis (2, 6-di-tert-butyl-4-tolyl) pentaerythritol phosphite.
The antioxidant is one or more of hindered phenol antioxidants and phosphite antioxidants.
The hindered phenol antioxidant is one or more of N, N' -hexamethylenebis (3, 5-di-tert-butyl-4-hydroxy-phenyl-propionamide), pentaerythritol tetra [1093,5-di-tert-butyl-4-hydroxy-phenyl) -propionate, triethylene glycol bis-3- (3-tert-butyl-4-hydroxy-5-methylphenyl) -propionate, beta- (4-hydroxy-3, 5-di-tert-butylphenyl) -propionate or spiro ethylene glycol bis [ beta- (3-tert-butyl-4-hydroxy-5-methylphenyl) -propionate ].
The phosphite antioxidant is one or more of 2, 4-di-tert-butylphenol and bis (2, 6-di-tert-butyl-4-tolyl) pentaerythritol phosphite. The antioxidant is one or more of hindered phenol antioxidants and phosphite antioxidants.
The lubricant is one or more of amide lubricants, polyethylene waxes and oxidized polyethylene lubricants.
The invention also provides a preparation method of the PBT composition, which comprises the following steps: and (3) uniformly mixing the components according to the proportion, adding the mixture into a double-screw extruder, melting, mixing, extruding and granulating to obtain the PBT composition.
Preferably, the preparation method of the PBT composition comprises the following steps: firstly preparing a sodium citrate solution, and mixing barium sulfate with the sodium citrate solution to obtain a mixed solution; and uniformly mixing the mixed solution with other components according to a proportion, adding the mixture into a double-screw extruder for melt mixing, extruding and granulating to obtain the PBT composition. Further, the mass percentage of sodium citrate in the sodium citrate solution is 1-10%, preferably 5%.
The invention also provides a PBT product, which is prepared from the PBT composition.
The invention also protects the application of the PBT composition. In particular to application of the PBT composition in preparing plastic products for laser welding. The laser wavelength of the laser welding is 920-1060nm, and further 940nm. Because the PBT composition has higher light transmittance to the laser wavelength of laser welding, when the PBT composition is applied to plastic products for laser welding, the welding strength of the plastic products can be effectively improved. The plastic products for laser welding include, but are not limited to, electromagnetic valve housings, communication valve housings, sensor housings, and diagnostic housings.
Compared with the prior art, the invention has the beneficial effects that:
according to the PBT composition, the light transmittance of the PBT composition is improved by adding a proper amount of sodium citrate and barium sulfate into the PBT at the same time, and the PBT composition has higher whiteness.
Detailed Description
The invention is further described below in connection with the following detailed description. The starting materials in both examples and comparative examples are commercially available or can be prepared by known methods. In the present specification, "part" and "%" respectively mean "part by weight" and "% by mass" unless otherwise specified.
The manufacturers and brands of the raw materials used in the following examples and comparative examples are as follows:
1. PBT resin:
PBT resin 1: the concentration of carboxyl end groups is 19mol/t, the mark GX 121 and chemical fiber is subjected to instrumentation;
PBT resin 2: the concentration of carboxyl end groups is 5mol/t, and the mark GX 121J is used for instrumentation of chemical fibers;
2. glass fiber: flat glass fiber with cross section length-width ratio of 3:1, glass fiber TFG-3.0-T436, taishan glass fiber Co., ltd;
3. barium sulfate
Barium sulfate 1: the average grain diameter is 1.3 mu m, superfine barium sulfate is 8000 meshes, shanghai Zhenjiang chemical company;
barium sulfate 2: the average particle diameter was 4.5. Mu.m, AH-3000, liaoning Ai Hai talc Co., ltd;
barium sulfate 3: the average particle diameter was 10. Mu.m, AH-1250, liaoning Ai Hai talc Co., ltd;
barium sulfate 4: average grain diameter is 0.3 μm, ER-185, and cloud sail chemical technology;
4. sodium citrate: chemically pure, commercially available, sodium citrate was used from the same sources for each of the examples and comparative examples;
5. and (3) a lubricant: oxidized polyethylene wax, commercially available, was used as the source of lubricant for each of the examples and comparative examples;
6. an antioxidant: antioxidant Y-001 and antioxidant Y-002, ratio 2:1, commercially available, the sources of antioxidants used in each example and comparative example were the same.
Examples and comparative examples
The contents (in parts by weight) of the respective components in the PBT compositions of examples and comparative examples are shown in tables 1 to 3.
The preparation method comprises the following steps: firstly preparing a sodium citrate solution with the mass percent of 5%, and mixing barium sulfate with the sodium citrate solution to obtain a mixed solution; and uniformly mixing the mixed solution with other components according to a proportion, adding the mixture into a double-screw extruder for melt mixing, extruding and granulating to obtain the PBT composition. Wherein the temperature of the twin-screw extruder is 200-240 ℃.
TABLE 1
| Component (A) | Example 1 | Example 2 | Example 3 | Example 4 | Example 5 |
| PBT resin 1 | 68.5 | 68.5 | 68.5 | 52 | 78.6 |
| Glass fiber | 30 | 30 | 30 | 40 | 20 |
| Barium sulfate 1 | 2 | 3 | 1 | 5 | 1 |
| Sodium citrate | 0.5 | 0.5 | 0.5 | 1 | 0.2 |
| Lubricant | 1 | 1 | 1 | 2 | 0.2 |
| Antioxidant | 0.5 | 0.5 | 0.5 | 1.2 | 0.2 |
TABLE 2
| Component (A) | Example 6 | Example 7 | Example 8 | Example 9 | Example 10 |
| PBT resin 1 | 68.5 | 54.5 | 70 | 68.5 | |
| PBT resin 2 | 68.5 | ||||
| Glass fiber | 30 | 30 | 30 | 25 | 30 |
| Barium sulfate 1 | 2 | 3 | 2 | ||
| Barium sulfate 2 | 2 | ||||
| Barium sulfate 4 | 2 | ||||
| Sodium citrate | 0.5 | 0.5 | 0.3 | 0.5 | 0.5 |
| Lubricant | 1 | 1 | 1 | 1 | 1 |
| Antioxidant | 0.5 | 0.5 | 0.5 | 0.5 | 0.5 |
TABLE 3 Table 3
Performance testing
PBT compositions prepared in the examples and comparative examples are injection molded with ISO mechanical bars and color plates, respectively. The relevant properties of the materials were tested according to the relevant criteria, as follows:
1. welding strength: light absorbing and transmitting splines were prepared separately. Wherein, the light absorption bars are prepared by adding 0.3% carbon black into the formulas of the above examples and comparative examples. Light transmitting bars were prepared from the above examples and comparative formulations.
The two sample bars are 120mm in size and 1.6mm in size, during welding, the two sample bars are overlapped and pressed by using a clamp, laser penetrates through the light-transmitting sample bars to reach the interface of the light-transmitting sample bar and the light-absorbing sample bar, molten plastic is melted, the width of a bonding wire is 2mm, each group of welding test is carried out on 5 sample bars, after welding, the welding test is carried out at normal temperature for 24 hours, and a universal tester is adopted for carrying out tensile test, so that pull-off force data are obtained.
2. Light transmittance at 940 nm: the injection molding was performed to obtain a color plate with a thickness of 2mm, and the transmittance of the color plate was measured by a laser transmittance measuring machine, and the laser wavelength was 940nm. Wherein, the bigger the transmissivity, the better the light transmission performance, and the more favorable the laser welding.
3. L value: the L value of the panel was measured with an X-rite7000A color difference meter, with a larger L value indicating a whiter whiteness.
The test results of each example and comparative example are shown in table 4.
Table 4 results of performance tests of examples and comparative examples
It is to be understood that the above examples of the present invention are provided by way of illustration only and not by way of limitation of the embodiments of the present invention. Other variations or modifications of the above teachings will be apparent to those of ordinary skill in the art. It is not necessary here nor is it exhaustive of all embodiments. Any modification, equivalent replacement, improvement, etc. which come within the spirit and principles of the invention are desired to be protected by the following claims.
Claims (9)
1. The PBT composition is characterized by comprising the following components in parts by weight:
54.5 to 78.6 portions of PBT resin;
20-40 parts of glass fiber;
1-5 parts of barium sulfate;
0.2-1 part of sodium citrate;
0.2-2 parts of lubricant;
0.2 to 1.2 portions of antioxidant;
the average particle size of the barium sulfate is less than or equal to 4.5 mu m;
the mass ratio of the barium sulfate to the sodium citrate is (4-6): 1.
2. the PBT composition according to claim 1, which comprises the following components in parts by weight:
54.5-70 parts of PBT resin;
25-30 parts of glass fiber;
2-3 parts of barium sulfate;
0.3-0.5 part of sodium citrate;
0.5-1 part of lubricant;
0.5 to 1 part of antioxidant.
3. The PBT composition of claim 1, wherein the barium sulfate has an average particle size of 0.3 to 1.3 μm.
4. The PBT composition according to claim 1, wherein the PBT resin has a carboxyl end group concentration of 15mol/t or less.
5. The PBT composition of claim 1, in which the glass fibers are flat glass fibers.
6. The method for preparing the PBT composition according to any one of claims 1 to 5, comprising the steps of: and (3) uniformly mixing the components according to the proportion, adding the mixture into a double-screw extruder, melting, mixing, extruding and granulating to obtain the PBT composition.
7. The process of claim 6, wherein the process of preparing the PBT composition comprises the steps of: firstly preparing a sodium citrate solution, and mixing barium sulfate with the sodium citrate solution to obtain a mixed solution; and uniformly mixing the mixed solution with other components according to a proportion, adding the mixture into a double-screw extruder for melt mixing, extruding and granulating to obtain the PBT composition.
8. A PBT article prepared from the PBT composition of any of claims 1 to 5.
9. Use of the PBT composition according to any of claims 1 to 5 for the preparation of plastic articles for laser welding.
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