Semiaromatic polyamide and method for producing same

A semi-aromatic and manufacturing method technology, applied in the field of semi-aromatic polyamide, can solve problems such as physical property damage, and achieve the effects of high bending elastic modulus, high heat resistance and excellent mechanical strength

Inactive Publication Date: 2012-10-17
UNITIKA LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0010] On the other hand, as a problem in the production of semi-aromatic polyamides, it is known that triamines formed by condensation of diamine components used as raw materials cause gel formation in polyamides and deterioration of their physical properties.

Method used

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  • Semiaromatic polyamide and method for producing same
  • Semiaromatic polyamide and method for producing same

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0104] [Process (i)]

[0105] 1,10-decanediamine (5050 parts by mass) as a diamine component, powdered terephthalic acid (4870 parts by mass) with an average particle diameter of 80 μm, benzoic acid (72 parts by mass) as an end-capping agent, Sodium hypophosphite monohydrate (6 parts by mass) as a polymerization catalyst was put into the autoclave, heated to 100° C., and then stirred with a double-helical stirring blade at a rotation speed of 28 rpm, and heated for 1 hour. The molar ratio of the raw material monomers is 1,10-decanediamine:terephthalic acid=50:50. The mixture was heated to 230° C. while maintaining the rotational speed at 28 rpm, and then heated at 230° C. for 3 hours. The formation reaction and fragmentation of salts and oligomers are carried out simultaneously. After releasing the pressure of the water vapor generated by the reaction, the obtained reactant was taken out.

[0106] [Process (ii)]

[0107] The reactant obtained in step (i) was polymerized by...

Embodiment 2

[0109] [Process (i)]

[0110]A mixture consisting of terephthalic acid powder (4870 parts by mass) with a volume average particle diameter of 80 μm, sodium hypophosphite (6 parts by mass) as a polymerization catalyst, and benzoic acid (72 parts by mass) as an end-capping agent was supplied to the screw. In a bar mixer-type reaction apparatus, under nitrogen-tight conditions, it was heated to 170°C while stirring with a double-helical stirring blade at a rotation speed of 30 rpm. After that, the temperature was kept at 170°C, and the rotation speed was kept at 30rpm. Using a liquid injection device, decanediamine (5050 parts by mass, 100% by mass) heated to 100°C was continuously heated at a rate of 28 parts by mass / min for 3 hours. (continuous injection method) added to terephthalic acid powder to obtain reactants.

[0111] [Process (ii)]

[0112] Then, in the ribbon mixer type reaction device used in the step (i), under the nitrogen flow, the reactant obtained in the step (...

Embodiment 3～6 and 9～10

[0113] Embodiment 3~6 and 9~10, comparative example 1

[0114] Except having changed the kind of the monomer used and manufacturing conditions as shown in Table 1, it carried out similarly to Example 2, obtained the semi-aromatic polyamide, and evaluated it.

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Abstract

Disclosed is a semiaromatic polyamide characterized by containing a terephthalic acid component and a diamine component, with the diamine component being any of 1,8-octanediamine, 1,10-decanediamine and 1,12-dodecanediamine. The semiaromatic polyamide is further characterized by the triamine units being 0.3 mol% or less of the diamine units therein.

Description

technical field [0001] The present invention relates to a semi-aromatic polyamide comprising a terephthalic acid component and a linear diamine component having an even number of carbon atoms. Background technique [0002] As industrialized semi-aromatic polyamides, polyamide 6T composed of terephthalic acid components and 1,6-hexamethylenediamine components, and polyamide 6T composed of terephthalic acid components and 1,9-nonanediamine components are known. Polyamide 9T. [0003] The semi-aromatic polyamides described above have higher heat resistance than aliphatic polyamides such as nylon-6 and nylon-66, and are also excellent in dimensional stability due to low water absorption. Therefore, taking advantage of such characteristics, it is widely used in the field of molded articles for electric / electronic parts and automobile parts in particular. In recent years, in these fields, there has been an increasing demand for further improvement in heat resistance and further ...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C08G69/26
CPCC08G69/28C08G69/26C08G69/30C08G69/265C08J5/00C08L77/06
Inventor 中井诚森本真梨子竹田裕孝
Owner UNITIKA LTD
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