Lignin modified PET (Polyethylene Terephthalate) composite material and preparation method thereof

A composite material and lignin technology, applied in the field of lignin-modified PET composite materials and its preparation, to achieve the effects of increasing phenyl content, reducing production costs, and improving heat resistance

Inactive Publication Date: 2012-01-04
SOUTHWEAT UNIV OF SCI & TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

At present, there is no report on the patent of using lignin and its derivatives to modify PET. Therefore, it is of great value to use lignin to modify PET composite materials to manufacture PET with high heat resistance and low cost.

Method used

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  • Lignin modified PET (Polyethylene Terephthalate) composite material and preparation method thereof
  • Lignin modified PET (Polyethylene Terephthalate) composite material and preparation method thereof

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0021] A preparation method of lignin modified PET composite material, comprising the following steps:

[0022] (1) Esterification reaction: add alkali lignin, ethylene glycol, terephthalic acid and zinc acetate into the reaction kettle according to the mass ratio of 1:30:68.8:0.2, and gradually heat up to 200°C under the protection of nitrogen. The pressure of the reactor was controlled at 0.2MPa, and after reacting for 2 hours at a stirring speed of 100rpm, lignin-modified ethylene terephthalate was obtained;

[0023] (2) Polycondensation reaction. Control the temperature of the lignin-modified ethylene terephthalate prepared in step (1) at 220°C, reduce the pressure in the reactor to 0.03MPa with a vacuum pump, react at a stirring speed of 100rpm for 2 hours, and stop heating , after the temperature in the reactor dropped to 200°C, the material was discharged to obtain a lignin-modified PET composite material, and the heat resistance test results are shown in Table 1.

Embodiment 2

[0025] A preparation method of lignin modified PET composite material, comprising the following steps:

[0026] (1) Esterification reaction: add lignosulfonic acid, ethylene glycol, terephthalic acid and zinc acetate into the reaction kettle according to the mass ratio of 1:30:68.8:0.2, and gradually heat up to 200°C under nitrogen protection , the pressure of the reactor was controlled at 0.2MPa, and after reacting for 2 hours at a stirring speed of 100rpm, lignin-modified ethylene terephthalate was obtained;

[0027] (2) Polycondensation reaction. Control the temperature of the lignin-modified ethylene terephthalate prepared in step (1) at 220°C, reduce the pressure in the reactor to 0.03MPa with a vacuum pump, react at a stirring speed of 100rpm for 2 hours, and stop heating , after the temperature in the reactor dropped to 200°C, the material was discharged to obtain a lignin-modified PET composite material, and the heat resistance test results are shown in Table 1.

Embodiment 3

[0029] A preparation method of lignin modified PET composite material, comprising the following steps:

[0030] (1) Esterification reaction: Add magnesium lignosulfonate, ethylene glycol, terephthalic acid and zinc acetate into the reactor according to the mass ratio of 1:30:68.8:0.2, and gradually heat up to 200 °C under nitrogen protection. °C, the pressure of the reactor was controlled at 0.2MPa, and after 2 hours of reaction at a stirring speed of 100rpm, lignin-modified ethylene terephthalate was obtained;

[0031] (2) Polycondensation reaction. Control the temperature of the lignin-modified ethylene terephthalate prepared in step (1) at 220°C, reduce the pressure in the reactor to 0.03MPa with a vacuum pump, react at a stirring speed of 100rpm for 2 hours, and stop heating , after the temperature in the reactor dropped to 200°C, the material was discharged to obtain a lignin-modified PET composite material, and the heat resistance test results are shown in Table 1.

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Abstract

The invention relates to a lignin modified PET composite material and a preparation method thereof. The method is characterized by comprising the following steps of: (1) respectively adding 0.5-5 mass percent of lignin, 50-80 mass percent of terephthalic acid, 20-50 mass percent of glycol and 0.1-1 mass percent of zinc acetate into a reaction kettle for esterification reaction, wherein reaction conditions are as follows: the temperature is 200-280DEG C, the pressure is 0.1-0.6MPa, the stirring speed is 100-300rpm, and the reaction time is 2-6 hours; (2) carrying out polycondensation reaction on the product of the esterification reaction under a vacuum condition to obtain the lignin modified PET composite material, wherein the reaction conditions are as follows: the temperature is 220-260DEG C, the pressure is 0.015-0.03MPa, the stirring speed is 100-300rpm, the reaction time is 2-6 hours, and the discharged material temperature is 180-200DEG C. The invention has the characteristics ofhigh heat resistance of the product, low cost, environmental protection and the like.

Description

technical field [0001] The invention relates to a lignin-modified PET composite material and a preparation method thereof, belonging to the field of polymer compound materials. technical background [0002] PET (polyethylene terephthalate), commonly known as "polyester", is a high-transparency, high-hardness thermoplastic resin with superior mechanical properties, friction properties, creep resistance, dimensional stability and electrical insulation performance, and thus widely used. For example, in the machinery industry, it can be used to manufacture bearings, chains, gears, cams, gaskets, etc.; in chemical equipment, it can be used to manufacture oil-resistant and aromatic-resistant friction parts and oil delivery pipes; it can be used in the field of electrical and electronic insulation. Motor slot insulation, capacitor film, etc. With the development of industrial technology, higher requirements are put forward for the performance of PET. Among them, how to improve th...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C08G63/688C08G63/183C08G63/78
Inventor 马寒冰杨莉李秀云
Owner SOUTHWEAT UNIV OF SCI & TECH
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