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Prepn process of in-situ compound thermal liquid crystal polyester material with both fireproof and reinforcing performance

An in-situ composite material and a technology of liquid crystal polyester, which is applied in the field of preparing thermotropic liquid crystal polyester in-situ composite materials with both flame retardancy and reinforcement, which can solve the problems of poor compatibility of blending systems, equipment wear, and decreased fluidity and other problems, to achieve the effect of expanding application space, prolonging service life and eliminating friction

Inactive Publication Date: 2006-02-15
SICHUAN UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Although this method can improve the flame retardant properties of polyethylene terephthalate, due to the conventional simple additive flame retardants, such as halogen-containing flame retardants, inorganic flame retardants, etc. Due to the difference in structure of alcohol esters, the compatibility of the blend system is poor, and microscopic phase separation is prone to occur, thus destroying the excellent mechanical properties of the polyethylene terephthalate material itself.
In this case, if the traditional macroscopic fiber, namely glass fiber, is used for reinforcement, on the one hand, the viscosity of the system will be increased during processing, resulting in a decrease in fluidity and poor processability; Bring wear and tear to the equipment and shorten the service life of the equipment

Method used

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  • Prepn process of in-situ compound thermal liquid crystal polyester material with both fireproof and reinforcing performance
  • Prepn process of in-situ compound thermal liquid crystal polyester material with both fireproof and reinforcing performance
  • Prepn process of in-situ compound thermal liquid crystal polyester material with both fireproof and reinforcing performance

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Experimental program
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Effect test

Embodiment 1～5

[0022] (1) Vacuum drying The polyethylene terephthalate of each embodiment listed in table 1 and the proportioning of the multi-component copolyester containing flame retardant element and mesogen simultaneously, put material into vacuum oven respectively Among them, it is advisable to dry at a vacuum degree of 0.1-10mmHg and a temperature of 70-90°C for more than 20 hours, and control the moisture content of 0.5-5%.

[0023] (2) Mechanical mixing Put the vacuum-dried material into a high-speed rotator to stir and mix evenly.

[0024] (3) Melt blending and extrusion Put the uniformly mixed materials into an ordinary twin-screw extruder for melt blending and extrusion. The temperature of each section of the extruder is controlled at 235°C, 250°C, 280°C, 295°C, 280°C, 280°C, and 270°C respectively, the head temperature is 260°C, and the screw speed of the extruder is 20-50 rpm.

[0025] (4) Drafting The extruded strips are drawn under air at room temperature, and the drafting r...

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Abstract

The present invention discloses the preparation process of in-situ compounded thermal liquid crystal polyester material with both fireproof and reinforcing performance. The preparation process may be one of adding polynary copolyester containing fireproof element and liquid crystal element simultaneously into polyethylene glycol terephthalate base material on the basis of conventional solution blending or melting blending process. The composite material thus prepared has both high fireproof efficiency and high mechanical performance. The present invention expands the application of polyester material in fireproof field.

Description

1. Technical field [0001] The invention belongs to the technical field of preparation of flame retardant products, and in particular relates to a method for preparing a thermotropic liquid crystal polyester in-situ composite material having both flame retardancy and reinforcement. 2. Background technology [0002] Polyethylene terephthalate (PET) has become a widely used thermoplastic polymer material due to its high breaking strength and elastic modulus, good thermal stability, light resistance and weather resistance. For fibers, engineering plastics, packaging materials, etc. However, like most organic polymer materials, due to its low oxygen index, only 20-22, its high flammability limits its application in the field of flame retardant materials. In order to change this situation, the traditional method is to add additive flame retardants to polyethylene terephthalate for blending modification. Although this method can improve the flame retardant properties of polyethyl...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C08L67/02C08K3/32
Inventor 王玉忠陈晓峰唐旭东赵弘吴博
Owner SICHUAN UNIV