Laser marking and shading enhanced PBT composition and preparation method and use thereof

Patent metadata

Field	Value
Publication number	US-12565574-B2
Application number	US-202118033806-A
Country	US
Kind code	B2
Filing date	Mar 24, 2021
Priority date	Oct 29, 2020
Publication date	Mar 3, 2026
Grant date	Mar 3, 2026

Abstract

Provided is a laser marking shading enhanced PBT composition, comprising, in parts by weight, the following components: 50-80 parts of a PBT resin, 6-20 parts of an opacifying agent, 15-30 parts of fiberglass, 0.1-0.5 parts of an antioxidant, and carbon black accounting for 0.0033-0.033% of the weight of the opacifying agent. In the present invention, when performing compounding with only an opacifying agent and a trace amount of carbon black without the use of an expensive laser marking agent, the composition has the properties of a whiteness value of more than 90, a shading of less than 3 mm, and a color difference value of more than 15 before and after laser marking. Therefore, the composition can be applied in the field of preparing lamp cup housings, capacitors, connectors, or relay articles in the lighting industry.

First claim

What is claimed is:

1 . A laser marking and shading enhanced PBT composition, comprising the following components in parts by weight:
50 to 80 parts of a PBT resin; 6 to 20 parts of a shading agent; 15 to 30 parts of a glass fiber; 0.1 to 0.5 part of an antioxidant; and a carbon black being 0.0033% to 0.033% of a weight of the shading agent.

2 . The laser marking and shading enhanced PBT composition of claim 1 , comprising the following components in parts by weight:
50 to 60 parts of the PBT resin; 15 to 20 parts of the shading agent; 15 to 30 parts of the glass fiber; 0.1 to 0.5 part of the antioxidant; and the carbon black being 0.0033% to 0.033% of a weight of the shading agent.

3 . The laser marking and shading enhanced PBT composition of claim 2 , wherein the shading agent is one or more of titanium dioxide, zinc sulfide and antimony white.

4 . The laser marking and shading enhanced PBT composition of claim 3 , wherein the shading agent is the titanium dioxide.

5 . The laser marking and shading enhanced PBT composition of claim 2 , wherein the carbon black is an acetylene carbon black or a conductive carbon black.

6 . The laser marking and shading enhanced PBT composition of claim 2 , wherein the glass fiber is an alkali-free glass fiber with a diameter of 7 to 17 μm and a length of 3 to 5 mm.

7 . The laser marking and shading enhanced PBT composition of claim 2 , wherein the antioxidant is one or more of a hindered phenolic antioxidant, a phosphite ester antioxidant and a thioester antioxidant.

8 . The laser marking and shading enhanced PBT composition of claim 7 , wherein the antioxidant is the hindered phenolic antioxidant.

9 . A preparation method of the laser marking and shading enhanced PBT composition of claim 1 , comprising the following steps:
S1, mixing a dried PBT resin, a glass fiber, a shading agent, a carbon black and an antioxidant evenly, and putting a mixture into a main feeding hopper of a twin-screw extruder; S2, putting the glass fiber into a side feeding hopper of the twin-screw extruder; S3, setting a temperature of the twin-screw extruder to 220° C. to 250° C., a feeding amount thereof to 300 to 500 kg/h, and a host speed thereof to 300 to 400 rpm; and S4, extruding a melt by the twin-screw extruder and then machining the melt to obtain a laser marking and shading enhanced PBT composition.

10 . A use of the laser marking and shading enhanced PBT composition of claim 1 in preparation of a lamp cup shell, a capacitor, a connector, or a relay product.

11 . A preparation method of the laser marking and shading enhanced PBT composition of claim 2 , comprising the following steps:
S1, mixing a dried PBT resin, a glass fiber, a shading agent, a carbon black and an antioxidant evenly, and putting a mixture into a main feeding hopper of a twin-screw extruder; S2, putting the glass fiber into a side feeding hopper of the twin-screw extruder; S3, setting a temperature of the twin-screw extruder to 220° C. to 250° C., a feeding amount thereof to 300 to 500 kg/h, and a host speed thereof to 300 to 400 rpm; and S4, extruding a melt by the twin-screw extruder and then machining the melt to obtain a laser marking and shading enhanced PBT composition.

12 . A preparation method of the laser marking and shading enhanced PBT composition of claim 3 , comprising the following steps:
S1, mixing a dried PBT resin, a glass fiber, a shading agent, a carbon black and an antioxidant evenly, and putting a mixture into a main feeding hopper of a twin-screw extruder; S2, putting the glass fiber into a side feeding hopper of the twin-screw extruder; S3, setting a temperature of the twin-screw extruder to 220° C. to 250° C., a feeding amount thereof to 300 to 500 kg/h, and a host speed thereof to 300 to 400 rpm; and S4, extruding a melt by the twin-screw extruder and then machining the melt to obtain a laser marking and shading enhanced PBT composition.

13 . A preparation method of the laser marking and shading enhanced PBT composition of claim 4 , comprising the following steps:
S1, mixing a dried PBT resin, a glass fiber, a shading agent, a carbon black and an antioxidant evenly, and putting a mixture into a main feeding hopper of a twin-screw extruder; S2, putting the glass fiber into a side feeding hopper of the twin-screw extruder; S3, setting a temperature of the twin-screw extruder to 220° C. to 250° C., a feeding amount thereof to 300 to 500 kg/h, and a host speed thereof to 300 to 400 rpm; and S4, extruding a melt by the twin-screw extruder and then machining the melt to obtain a laser marking and shading enhanced PBT composition.

14 . A preparation method of the laser marking and shading enhanced PBT composition of claim 5 , comprising the following steps:
S1, mixing a dried PBT resin, a glass fiber, a shading agent, a carbon black and an antioxidant evenly, and putting a mixture into a main feeding hopper of a twin-screw extruder; S2, putting the glass fiber into a side feeding hopper of the twin-screw extruder; S3, setting a temperature of the twin-screw extruder to 220° C. to 250° C., a feeding amount thereof to 300 to 500 kg/h, and a host speed thereof to 300 to 400 rpm; and S4, extruding a melt by the twin-screw extruder and then machining the melt to obtain a laser marking and shading enhanced PBT composition.

15 . A preparation method of the laser marking and shading enhanced PBT composition of claim 6 , comprising the following steps:
S1, mixing a dried PBT resin, a glass fiber, a shading agent, a carbon black and an antioxidant evenly, and putting a mixture into a main feeding hopper of a twin-screw extruder; S2, putting the glass fiber into a side feeding hopper of the twin-screw extruder; S3, setting a temperature of the twin-screw extruder to 220° C. to 250° C., a feeding amount thereof to 300 to 500 kg/h, and a host speed thereof to 300 to 400 rpm; and S4, extruding a melt by the twin-screw extruder and then machining the melt to obtain a laser marking and shading enhanced PBT composition.

16 . A preparation method of the laser marking and shading enhanced PBT composition of claim 7 , comprising the following steps:
S1, mixing a dried PBT resin, a glass fiber, a shading agent, a carbon black and an antioxidant evenly, and putting a mixture into a main feeding hopper of a twin-screw extruder; S2, putting the glass fiber into a side feeding hopper of the twin-screw extruder; S3, setting a temperature of the twin-screw extruder to 220° C. to 250° C., a feeding amount thereof to 300 to 500 kg/h, and a host speed thereof to 300 to 400 rpm; and S4, extruding a melt by the twin-screw extruder and then machining the melt to obtain a laser marking and shading enhanced PBT composition.

17 . A preparation method of the laser marking and shading enhanced PBT composition of claim 8 , comprising the following steps:
S1, mixing a dried PBT resin, a glass fiber, a shading agent, a carbon black and an antioxidant evenly, and putting a mixture into a main feeding hopper of a twin-screw extruder; S2, putting the glass fiber into a side feeding hopper of the twin-screw extruder; S3, setting a temperature of the twin-screw extruder to 220° C. to 250° C., a feeding amount thereof to 300 to 500 kg/h, and a host speed thereof to 300 to 400 rpm; and S4, extruding a melt by the twin-screw extruder and then machining the melt to obtain a laser marking and shading enhanced PBT composition.

Assignees

• Kingfa Science & Technology Co

Inventors

• Mo Wenjie
• Huang Xianbo
• Ye Nanbiao
• Zhu Wen
• Gong Dejun
• Feng Jian
• Fu Xuejun

Classifications

• C08K2201/014

  Additives containing two or more different additives of the same subgroup in C08K · CPC title

• C08K2201/004

  Additives being defined by their length · CPC title

• C08K2201/003

  Additives being defined by their diameter · CPC title

• C08K2003/2241

  Titanium dioxide · CPC title

• C08K7/14

  Glass · CPC title