High-heat-resisting glass-fiber reinforced polyester composite material and preparing method

A polyester composite material, high heat-resistant technology, applied in the field of polymer materials, can solve the problems of difficult adjustment of injection molding process parameters, large decline in heat resistance performance, rough surface of parts, etc., to achieve easy control of production process, high strength and impact, the effect of reducing energy consumption

Inactive Publication Date: 2007-11-14
SHENZHEN KEJU NEW MATERIAL
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, due to its special chemical structure, unmodified PET determines its inherent defects: poor toughness, easy warping after heating, rough surface of parts at low mold temperature, these defects seriously affect its industrial use value
Relevant foreign patents have introduced the nucleating agent used in detail. For example, the patent No. USP3435093 uses an alkali metal salt of ethylene / methacrylic acid copolymer as a nucleating agent. The disadvantage of this nucleating system is that the melt index of PET is greatly reduced. , it is difficult to adjust the injection molding process parameters when forming large parts or thick-walled products
USP4448913 uses a compound of sodium benzoate and polyolefin as a nucleating agent. The disadvantage of this nucleating system is that although the addition of polyolefin improves the melt index of PET, its heat resistance decreases greatly, and the heat resistance temperature can only reach 190 degrees, and the cost is high

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0032] The weight percentage of PET is 52%, sodium stearate 0.3%, epoxy chain extender 2%, brominated flame retardant and flame retardant synergist 13%, toughening agent 2%, lubricant 0.5%, anti- Mix 0.2% oxygen agent in a medium-speed mixer for 5 minutes, then blend with 30% glass fiber, extrude through a twin-screw extruder with a melting temperature of 200--260°C, and granulate. The temperature of each section is: 200°C in the first zone, 240°C in the second zone, 255°C in the third zone, 260°C in the fourth zone, 245°C in the fifth zone, and the residence time is 90 seconds.

Embodiment 2

[0034] The weight percentage of PET is 51.9%, sodium stearate 0.4%, epoxy chain extender 2%, brominated flame retardant and flame retardant synergist 13%, toughening agent 2%, lubricant 0.5%, anti- Mix 0.2% oxygen agent in a medium-speed mixer for 5 minutes, then blend with 30% glass fiber, extrude through a twin-screw extruder with a melting temperature of 200--260°C, and granulate. The temperature of each section is: 200°C in the first zone, 240°C in the second zone, 255°C in the third zone, 260°C in the fourth zone, 245°C in the fifth zone, and the residence time is 90 seconds.

Embodiment 3

[0036] The weight percentage of PET is 51.8%, sodium stearate 0.5%, epoxy chain extender 2%, brominated flame retardant and flame retardant synergist 13%, toughening agent 2%, lubricant 0.5%, anti- Mix 0.2% oxygen agent in a medium-speed mixer for 5 minutes, then blend with 30% glass fiber, extrude through a twin-screw extruder with a melting temperature of 200--260°C, and granulate. The temperature of each section is: 200°C in the first zone, 240°C in the second zone, 255°C in the third zone, 260°C in the fourth zone, 245°C in the fifth zone, and the residence time is 90 seconds.

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Abstract

The present invention discloses a kind of high-heat-resistant, glass-fiber-enhanced, polyester composite and its preparation method. The components (weight percentage) are: polyester 45-95%; nucleating agent-sodium stearic acid 0.3-5%; brominated flame retardant 5-30%; flame retardant synergist 4-10%; toughening agent 1-6%; antioxidant 0.1-1%; lubricant 0.1-5%; glass fiber 5-50%. The present invention uses organic-nucleating-agent sodium stearic acid, acrylic core-shell copolymer toughening agent and epoxy-group-containing material as chain extender, thus, increases the crystallization rate of PET, makes the prepared composite forming at a lower temperature, that is 70-100 degree C. Therefore, no oil heating machine needs to be added, which reduces the energy consumption, and meanwhile ensures the material's high heat resistance, high strength and high impact resistance; the material is low in cost, simple in preparation process, and easy to control its production process.

Description

technical field [0001] The invention relates to the technical field of polymer materials, in particular to a high heat-resistant glass fiber reinforced polyester composite material and a preparation method thereof. Background technique [0002] PET (polyethylene terephthalate) resin is the cheapest among the five general-purpose engineering plastic matrix resins. However, due to its special chemical structure, unmodified PET determines its inherent defects: poor toughness, easy warping after heating, rough surface of parts at low mold temperature, these defects seriously affect its industrial use value. In order to make full use of the low-cost performance of PET and meet the needs of industrial use, people have done a lot of modification research work, among which DuPont Company of the United States and Toyobo Company of Japan are at the forefront of technology. FR530 of DuPont Company of the United States and EMC170 of Toyobo Company of Japan are widely used in the field...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C08L67/03C08K7/14B29B9/12B29C47/40B29C47/92C08L63/00C08K3/22C08K5/09B29C48/92B29C48/95
CPCB29C47/92B29C48/04B29C48/95
Inventor 李小波徐东贺永
Owner SHENZHEN KEJU NEW MATERIAL
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