Transparent co-polyamide and preparation thereof

A copolyamide and transparent technology, which is applied in the field of transparent copolyamide and its preparation, can solve the problems of high cost and achieve the effects of low cost, simplified production process, shortened operation cycle and energy consumption

Inactive Publication Date: 2010-12-08
SOUTH CHINA UNIV OF TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0008] The above patent application technology has the following disadvantages: the use of high-cost cycloaliphatic diamine and branched aliphatic diamine in the synthesis process, and the current production of high-performance transparent nylon is limited to foreign countries, so the development has independent intellectual property rights, and the production cost is relatively low. Low transparent nylon has important research and application significance

Method used

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  • Transparent co-polyamide and preparation thereof
  • Transparent co-polyamide and preparation thereof
  • Transparent co-polyamide and preparation thereof

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0032] Mix 120g of ethylenediamine and water into a three-necked flask with stirring, heat to 55°C, add 336g of dimer acid C 34 h 62 (COOH) 2 Slowly add the paste made of 232.6g of isophthalic acid and water into a three-necked flask, react at 55°C, adjust the pH of the reaction material to 7.0, keep it warm for 0.5h, and cool to obtain the required salt solution . Mix the prepared salt solution and 0.07g of tin protochloride evenly, add to the polymerization kettle, charge and release CO 2 three times, and finally filled with CO 2 to a pressure of 0.05MPa, then heat up to raise the temperature to 200°C within 1h, and the pressure inside the polymerization tank to 1.8MPa, keep it in this state for 2h, then slowly deflate to normal pressure in 1h, in this state After reacting for 1 hour, the material was discharged to obtain transparent copolymerized polyamide PEDI3, and its various performance indicators are shown in Table 1.

Embodiment 2

[0034] Mix 120g of ethylenediamine and water into a three-necked flask with stirring, heat to 75°C, add 560g of dimer acid C 34 h 62 (COOH) 2 Slowly add the paste made of 166g of isophthalic acid and water into a three-necked flask, react at 75°C, adjust the pH of the reaction material to 7.1, keep it warm for 1 hour, and cool to obtain the desired salt solution. Mix the prepared salt solution and 0.08g of tin protochloride evenly, add to the polymerization kettle, charge and release CO 2 three times, and finally filled with CO 2 until the pressure is 0.1MPa, then heat up to raise the temperature to 280°C within 1.5h, and the pressure in the polymerization tank rises to 2.5MPa, keep it in this state for 3h, then slowly deflate to normal pressure within 1.5h, After reacting in this state for 1.5 hours, the material was discharged to obtain transparent copolyamide PEDI5, and its various performance indicators are shown in Table 1.

Embodiment 3

[0036] Mix 120g of ethylenediamine and water into a stirred three-neck flask, heat to 100°C, and mix 784g of dimer acid C 34 h 62 (COOH) 2 Slowly add the paste made of 100g of isophthalic acid and water into a three-necked flask, react at 100°C, adjust the pH value of the reaction material to 7.2, keep it warm for 2 hours, and cool to obtain the desired salt solution. Mix the prepared salt solution and 0.1g of tin protochloride evenly, add to the polymerization kettle, charge and release CO 2 three times, and finally filled with CO 2until the pressure is 0.2MPa, then heat up to raise the temperature to 320°C within 2h, and the pressure inside the polymerization tank rises to 3.2MPa, keep it in this state for 2.5h, and then slowly deflate to normal pressure within 2h. After reacting for 2 hours under the state, the material is discharged, and the transparent copolyamide PEDI7 is obtained, and its various performance indicators are shown in Table 1.

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Abstract

The invention discloses a transparent copolyamide and a preparation method thereof. The cheap domestic dimer acid, aromatic dibasic acid and aliphatic linear chain diamine are taken as raw materials to undergo melt polycondensation and obtain the copolyamide. The light transmittance of the copolymer is up to more than 90%, and the copolymer has high heat resistance and good forming and processingperformance. By taking the dimer acid, the aromatic dibasic acid and the aliphatic linear chain diamine as the raw materials, compared with the existing salt forming method, the method for forming salt in aqueous solution greatly reduces the production cost, simplifies the production process and shortens the operation period. The transparent copolyamide is a polymer which has high molecular weight and is prepared by taking the dibasic acid and the aliphatic linear chain diamine as the raw materials, forming salt and polymerizing in the aqueous solution, and the intrinsic viscosity of the transparent copolyamide is up to 2.1dL.g<-1>.

Description

technical field [0001] The present invention relates to a transparent copolyamide and its preparation method, in particular to a transparent copolyamide obtained by using domestic cheap dimer acid, aromatic dibasic acid and aliphatic linear diamine as raw materials and its preparation method . Background technique [0002] Nylon (polyamide) is the earliest and most widely used thermoplastic engineering plastic at home and abroad. Due to its excellent characteristics such as toughness, wear resistance, impact resistance, fatigue resistance, corrosion resistance, oil resistance, etc., especially excellent wear resistance and self-lubricating properties, and small friction coefficient, it has been steadily competing with other engineering plastics for forty years. Growth, its demand has so far ranked first among the five major engineering plastics. In many applications, especially in some occasions that require high physical and mechanical properties of transparent materials,...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C08G69/34C08G69/28
Inventor 章永化王文志
Owner SOUTH CHINA UNIV OF TECH
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