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Polyamide resin, polyamide resin composition, and molded article comprising same

A technology of polyamide resin and composition, which is applied in the field of polyamide resin, can solve the problems of high content, etc., and achieve the effects of low water absorption and excellent melt retention stability

Inactive Publication Date: 2012-05-09
TORAY IND INC
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, there is a problem that the content of 2,3,4,5-tetrahydropyridine and piperidine as impurities in 1,5-pentanediamine, which is a raw material of nylon 510, is large, and nylon 510 obtained by heat polycondensation The melting point of Nylon is lower than the melting point (216°C) of nylon 510 obtained by interfacial polycondensation shown in Non-Patent Document 1, and there are structural defects

Method used

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  • Polyamide resin, polyamide resin composition, and molded article comprising same
  • Polyamide resin, polyamide resin composition, and molded article comprising same
  • Polyamide resin, polyamide resin composition, and molded article comprising same

Examples

Experimental program
Comparison scheme
Effect test

Embodiment

[0101] [Analysis of impurities contained in raw material 1,5-pentanediamine]

[0102] It carried out by the GC-MS method under the conditions shown below.

[0103] GC / MS: HP6980 / HP5973A

[0104] Column: NUKOL30m×0.24mmI.D.0.2μm film

[0105] Oven: 120°C (fixed)

[0106] InJ: 200°C (split ratio 10:1)

[0107] Flow rate: He2.4ml / min (constant flow)

[0108] MS: 230°C (scan m / z=30-400).

[0109] [Extraction of polyamide resin from polyamide resin composition compounded with fibrous filler]

[0110] 10 g of the polyamide resin composition was dissolved in 100 ml of hexafluoroisopropanol, and this was filtered to remove the fibrous filler. After evaporating the filtrate, it vacuum-dried at 80 degreeC for 12 hours, and obtained the polyamide resin extract.

[0111] [Relative viscosity (ηr)]

[0112] In 98% sulfuric acid, the measurement was performed using an Ostwald viscometer at a concentration of 0.01 g / ml at 25°C.

[0113] [Amino terminal group]

[0114] Accurately wei...

reference example 1

[0135] Reference example 1 (adjustment of lysine decarboxylase)

[0136] E. coli JM109 strain was cultured as follows. First, this strain was inoculated with 1 platinum loop in 5 ml of LB medium, and shaken at 30° C. for 24 hours to perform preculture. Next, 50 ml of the LB medium was added to a 500 ml Erlenmeyer flask, and steam sterilized at 115° C. for 10 minutes in advance. The above-mentioned strain after pre-culture was continuously inoculated in this medium, and culture was carried out for 24 hours while adjusting the pH value to 6.0 with 1N hydrochloric acid aqueous solution under conditions of an amplitude of 30 cm and 180 rpm. The bacterial cells thus obtained were collected, and subjected to ultrasonication and centrifugation to prepare a cell-free extract. The measurement of these lysine decarboxylase activities was carried out according to a conventional method (Kenji Satoda, Haruo Mizono, Biochemical Mitsuko Lecture, vol. 11, P. 179-191 (1976)). In the case of...

reference example 2

[0137] Reference example 2 (production of 1,5-pentanediamine)

[0138] With 0.1N hydrochloric acid aqueous solution, according to 50mM lysine hydrochloride (manufactured by Wako Pure Chemical Industries), 0.1mM pyridoxal phosphate (manufactured by Wako Pure Chemical Industries), 40mg / L-roughly purified lysine decarboxylase (from Reference Example 1 preparation) to maintain the pH value of 1000ml of the aqueous solution at 5.5 to 6.5, while reacting at 45°C for 48 hours to obtain 1,5-pentanediamine hydrochloride. By adding sodium hydroxide to this aqueous solution, 1,5-pentanediamine hydrochloride was converted into 1,5-pentanediamine, extracted with chloroform, and distilled under reduced pressure (10 mmHg, 60° C.), thereby obtaining 1, 5-pentanediamine. The 2,3,4,5-tetrahydropyridine contained in this pentamethylenediamine was 0.18% by weight, and the piperidine was 0.011% by weight.

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Abstract

A polyamide resin obtained by heating and condensation-polymerizing ingredients mainly comprising pentamethylenediamine having a total content of 2,3,4,5-tetrahydropyridine and piperidine of 0.10 wt.% or lower and an aliphatic dicarboxylic acid having 7 or more carbon atoms, a 0.01 g / mL solution of the polyamide resin in 98% sulfuric acid having a relative viscosity at 25 C of 1.8-4.5. The polyamide resin has excellent heat resistance, extremely low water absorption, and excellent melt residence stability and is hence suitable for use as long molded articles represented by automotive radiator tanks, etc.

Description

technical field [0001] The present invention relates to a polyamide resin excellent in heat resistance, low water absorption, and retention stability. Background technique [0002] Polyamide resins are used for the top and bottom of radiator tanks, cylinder head covers, tanks, gears, valves, connections, etc. devices, through anchors, various containers, brake piping, fuel piping pipes, wheel cover exterior parts, etc. [0003] However, polyamide resin absorbs water more easily than other resins, and the rigidity and heat resistance of the material decrease due to water absorption, and the dimension is easy to change, so it is an obstacle when it is applied to resin parts. In addition, materials with higher resistance to calcium chloride and magnesium chloride sprayed as road surface antifreeze agents in winter are required. [0004] High-grade polyamides represented by nylon 610 and nylon 612 are known to have lower water absorption than nylon 6 and nylon 66, so they have...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C08G69/26C08K7/04C08L77/06
CPCC08L77/06C08G69/26C08K7/14C08K7/06
Inventor 加藤公哉增永淳史松冈英夫
Owner TORAY IND INC
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