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Polybutylece terephthalate (PBT) engineering plastics as well as preparation method and application thereof

A technology of engineering plastics and PBT resin, used in plastic/resin/wax insulators, organic insulators, etc., can solve the problems of PBT plastic glow-wire test performance, low tracking resistance and other problems, and achieve large market competitiveness and a wide range of sources. , the effect of improving performance

Inactive Publication Date: 2011-05-04
SHENZHEN KEJU NEW MATERIAL
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0004] In view of this, the embodiment of the present invention provides a PBT engineering plastic to solve the technical problems of PBT plastic glow wire test performance and low tracking index in the prior art

Method used

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  • Polybutylece terephthalate (PBT) engineering plastics as well as preparation method and application thereof
  • Polybutylece terephthalate (PBT) engineering plastics as well as preparation method and application thereof

Examples

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preparation example Construction

[0052] Embodiments of the present invention further provide a method for preparing PBT engineering plastics, comprising the steps of:

[0053] S01, mixing and mixing the components in the following parts by weight to obtain a PBT engineering plastics precursor;

[0054] S02, extruding the PBT engineering plastic precursor at 220-240°C to obtain PBT engineering plastics, adding glass fibers in parts by weight of 28-33 in the extrusion processing step,

[0055] PBT resin 45-75

[0056] Flame retardant 15-30

[0057] Flame Retardant Synergist 4-10

[0058] Lubricant 0.8-1.2

[0059] Toughener 3-5

[0060] Antioxidant 0.2-0.5

[0061] The flame retardant is selected from two or more of decabromodiphenylethane, brominated triazine, phosphorus nitrogen flame retardant, tetrabromobisphenol A; the flame retardant synergist is antimony trioxide and / or or sodium antimonate.

[0062] Specifically, in step S01, mix according to the order of PBT resin, toughening agent, lubricant, fla...

Embodiment 1

[0072] The following parts are parts by weight:

[0073] Dry 75 parts of polybutylene terephthalate (PBT) at 120°C for 2 hours, and control the moisture content at 0.04%;

[0074] Then dry 75 parts of PBT resin, 15 parts of decabromodiphenylethane, 15 parts of bromotriazine, 10 parts of antimony trioxide, 4 parts of toughening agent, 1 part of lubricant, 0.3 part of antioxidant in Stir in the mixing tank for 7 minutes to obtain the PBT engineering plastics precursor;

[0075] The PBT engineering plastic precursor is extruded and granulated by a twin-screw extruder, and at the same time, 30 parts by weight of glass fibers are added in the middle section of the twin-screw extruder. In the twin-screw extrusion granulation step, the temperature in the first zone is 220 ℃, the temperature in the second zone is 225℃, the temperature in the third zone is 230℃, the temperature in the fourth zone is 235℃, the temperature in the fifth zone is 230℃, the temperature in the sixth zone is ...

Embodiment 2

[0078] The following parts are parts by weight:

[0079] Dry 60 parts of polybutylene terephthalate (PBT) at 130°C for 3 hours, and control the moisture content at 0.04%;

[0080] After drying, 60 parts of PBT, 15 parts of bromotriazine, 10 parts of phosphorus nitrogen flame retardant, 2 parts of sodium antimonate, 6 parts of antimony trioxide, 4 parts of toughening agent, 1 part of lubricant, 0.3 parts of antimony The oxidizing agent was placed in a mixing tank and stirred for 5 minutes to obtain a PBT engineering plastic precursor;

[0081] The PBT engineering plastic precursor is extruded and granulated through a twin-screw extruder, and at the same time, 30 parts by weight of long glass fibers are added to the middle section of the twin-screw extruder. In the step of twin-screw extrusion and granulation, the temperature in the first zone is 225 ℃, the temperature in the second zone is 220 ℃, the temperature in the third zone is 232 ℃, the temperature in the fourth zone is...

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Abstract

The invention is suitable for the technical field of high polymer materials and provides polybutylece terephthalate (PBT) engineering plastics as well as a preparation method and an application thereof. The PBT engineering plastics comprise the following components in parts by weight: 45-75 parts of PBT resins, 15-30 parts of fire retardants, 4-10 parts of flame retardant synergist, 0.8-1.2 parts of lubricating agents, 28-33 parts of glass fibers, 3-5 parts of flexibilizer, and 0.2-0.5 part of antioxidant, wherein the fire retardants are two or more of decabromdiphenylethane (DBDPE), brominated triazine, phosphorus-nitrogen based flame retardant and tetrabromobisphenol A; and the flame retardant synergist is antimonous oxide or sodium antimonite. The glowing filament test value, the proof tracking index (PTI) and the like of the PBT engineering plastics can be greatly improved by the modification effect of the flame retardants and the flame retardant synergist. In the preparation method of the PBT engineering plastics, sources of the raw materials are wide, the cost is low, the preparation process is simple, the production process is smooth and controllable, and the productivity effect is high; and the preparation method of the PBT engineering plastics is suitable for industrial production.

Description

technical field [0001] The invention belongs to the technical field of polymer materials, and in particular relates to a PBT engineering plastic, its preparation method and application. Background technique [0002] Polybutylene terephthalate (PBT) is an excellent thermoplastic engineering plastic. Because of its excellent properties such as high heat resistance, toughness, fatigue resistance, weather resistance, and low water absorption, it has become popular in China in recent years. are widely used outside. After being modified by glass fiber or mineral filling to enhance flame retardancy, its mechanical strength is higher, and its molding shrinkage rate has been greatly improved, which can replace some metals, thermosetting plastics and other thermoplastics. [0003] However, the latest Australian standard puts forward high requirements for the glow wire test value (GWIT) of 850°C for 30s for electrical products used in extreme environments; the tracking index (CTI) ≥ 3...

Claims

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Application Information

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IPC IPC(8): C08L67/02C08K13/04C08K7/14C08K5/03C08K5/3492C08K5/136C08K3/22C08K3/24B29C47/92H01B3/42B29C48/92
CPCB29C48/92B29C48/875B29C2948/92704B29C2948/92895
Inventor 徐东徐永胡玉洁
Owner SHENZHEN KEJU NEW MATERIAL
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