Preparation method for laser-markable halogen-free fire retardation polyester having variable ground color

A laser marking, flame retardant polyester technology, applied in the field of polymer processing, can solve the problems of low absorption rate of halogen-free flame retardants, difficulty, little contrast between font color and background color, etc. Mechanical properties, excellent flame retardant effect

Inactive Publication Date: 2014-07-30
BEIJING CHEM IND RES INST
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Conventional polyester compositions are carbonized under laser irradiation, allowing dark marks to be obtained, however, it is difficult to obtain black marks
[0003] In recent years, the development of green and environmentally friendly halogen-free flame-retardant PBT is a trend, but the absorption rate of halogen-free flame retardants for laser light is low, the effect of laser marking is very poor, the obtained characters are blurred, and the contrast between the font color and the background color is not large
These defects limit its application in various fields

Method used

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  • Preparation method for laser-markable halogen-free fire retardation polyester having variable ground color
  • Preparation method for laser-markable halogen-free fire retardation polyester having variable ground color
  • Preparation method for laser-markable halogen-free fire retardation polyester having variable ground color

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preparation example Construction

[0021] The preparation method of the laser-markable halogen-free flame-retardant polyester with a variable background color proposed by the present invention comprises the following steps:

[0022] (1) Weigh the raw materials according to the following weight percentages:

[0023]

[0024] (2) Pre-dry the polybutylene terephthalate weighed according to the above proportion at 120-140°C for 4-6 hours, so that the moisture content in it is less than 0.05%. After drying, the polybutylene terephthalate Butylene glycol formate and other raw materials weighed in proportion are mixed uniformly in a twin-screw mixer;

[0025] (3) Send the mixture of the above step (2) into the twin-screw extruder, the feeding speed of the twin-screw extruder is 200rpm, and the temperature of each section of the twin-screw extruder is from the feed port to the machine head. The temperature is 230-235℃ in the first zone, 235-240℃ in the second zone, 240-250℃ in the third zone, 240-245℃ in the fourth...

Embodiment 1

[0036] (1) Weigh the raw materials according to the following percentages: polybutylene terephthalate: 74.9%; phthalocyanine blue: 1%; copper oxide: 0.5%; mica: 1%; organic phosphate and melamine cyanuric acid Salt Flame Retardant Blend: 18%; Hindered Phenolic and Phosphite Antioxidants: 0.6%; Ethylene-Butyl Methacrylate-Glycidyl Methacrylate Terpolymer: 3.5%; Stearin Calcium acid: 0.5%.

[0037] (2) Pre-dry the polybutylene terephthalate weighed according to the above ratio at 130°C for 5 hours, so that the water mass percentage in it is less than 0.05%, and the dried polyester resin is mixed with other The weighed raw materials are mixed evenly in a double screw mixer.

[0038] (3) Send the above-mentioned mixture into the twin-screw extruder, the feeding speed of the twin-screw extruder is 200rpm, and the temperature of each section of the twin-screw extruder from the feeding port to the head of the machine is respectively a zone The temperature is 230°C, the temperature ...

Embodiment 2

[0040] (1) Weigh the raw materials according to the following percentages: polybutylene terephthalate: 74.9%; phthalocyanine blue: 1%; iron oxide: 0.5%; mica: 1%; organic phosphate and melamine cyanuric acid Salt Flame Retardant Blend: 18%; Hindered Phenolic and Phosphite Antioxidants: 0.6%; Ethylene-Butyl Methacrylate-Glycidyl Methacrylate Terpolymer: 3.5%; Stearin Calcium acid: 0.5%.

[0041] (2) Pre-dry the polybutylene terephthalate weighed according to the above ratio at 130°C for 5 hours, so that the water mass percentage in it is less than 0.05%, and the dried polyester resin is mixed with other The weighed raw materials are mixed evenly in a double screw mixer.

[0042] (3) Send the above mixture into the twin-screw extruder. The feeding speed of the twin-screw extruder is 200rpm. The temperature is 230°C, the temperature in the second zone is 235°C, the temperature in the third zone is 240°C, the temperature in the fourth zone is 240°C, the temperature in the fifth ...

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Abstract

The present invention relates to a preparation method for a laser-markable halogen-free fire retardation polyester having a variable ground color, and belongs to the technical field of polymer processing. The halogen-free fire retardation polyester comprises, by weight, 40-87% of polybutylene terephthalate, 0.1-2% of a coloring agent, 0.2-1% of a metal oxide, 0-2% of a silicate mineral, 10-30% of a halogen-free fire retardation agent, 2-10% of a toughening agent, 0.2-1% of an antioxidant, 0.5-1.5% of a processing auxiliary agent, and 0-40% of continuous glass fibers. The preparation method comprises: drying various components, uniformly mixing according to a certain ratio, conveying into a twin-screw extruder, and carrying out melting, mixing, extruding, strip drawing, cooling, drying and palletizing through the extruder to obtain particles. The laser-markable halogen-free fire retardation polyester has characteristics of excellent fire retardation, excellent mechanical property and multiple colors, and presents the black marker with the clear edge and high contrast degree in the laser beam irradiation. The preparation method is simple and is suitable for continuous mass production.

Description

technical field [0001] The invention relates to a preparation method of a laser-markable halogen-free flame-retardant polyester with a variable background color, which belongs to the technical field of polymer processing. Background technique [0002] Thermoplastic polyester polybutylene terephthalate (PBT), widely used in electronic appliances, auto parts and other industries. Most of these plastic products need to be marked, marked or coded in some form, and laser marking is widely used for marking because of its environmental friendliness, permanent marking and flexible marking. The traditional polyester composition is carbonized under laser irradiation, and dark marks can be obtained, but it is very difficult to obtain black marks. [0003] In recent years, the development of green and environmentally friendly halogen-free flame-retardant PBT is a trend, but the halogen-free flame retardant has a low absorption rate for laser light, and the effect of laser marking is ve...

Claims

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Application Information

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IPC IPC(8): C08L67/02C08K13/04C08K7/14C08K3/22C08K3/34C08K5/521C08K5/3492B29B9/06B29C47/92B29C48/92
CPCB29B7/46B29B7/72B29B7/7461B29B7/90B29B9/06B29B9/12B29B9/14B29C48/40B29C48/92B29C2948/9259B29C2948/92704B29C2948/92895C08K3/22C08K3/346C08K5/098C08K5/134C08K5/3417C08K5/34924C08K5/521C08K5/524C08L23/0884C08L67/02C09K21/12
Inventor 李小雅钱志国曹亮贾义军毕立唐鸣边策胡永宁
Owner BEIJING CHEM IND RES INST
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