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Polyamide Resin and Hinged Molded Product

a polyamide resin and hinged molding technology, applied in the field of polyamide resins, can solve the problems of deterioration of retention heat stability, insufficient vibration welding strength, and inability to reduce the thickness of intake manifolds to a limited extent, and achieve excellent vibration welding strength, retention heat stability, and low temperature toughness and transparency.

Inactive Publication Date: 2007-10-25
MITSUBISHI CHEM CORP
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Benefits of technology

[0027] The polyamide resin or polyamide resin composition of the present invention is excellent in vibration-welding strength, retention heat stability, low-temperature toughness and transparency. Also, the polyamide resin or polyamide resin composition of the present invention can provide a vibration welded molded product, a hinged molded product, a binding band and a filament. In particular, the hinged molded product produced from the polyamide resin of the present invention can exhibit an extremely high hinge property. Further, the polyamide resin of the present invention can be produced from a biomass-derived material, and is thus expected to exhibit a remarkably high effect of reducing a burden to environments in various industrial fields. Therefore, the present invention has a high industrial value in this regard. In addition, the hinged molded product of the present invention can exhibit an extremely high hinge property, and have a higher heat resistance (melting point) than that of a hinged molded product produced from 6 nylon as well as mechanical properties identical to or higher than those of the hinged molded product produced from 6 nylon. For this reason, the hinged molded product is suitable, in particular, as hinged parts used in an engine room of automobiles, and may also be useful as various hinged parts. Further, the polyamide resin and the hinged molded product of the present invention can be produced from a biomass-derived material, and is thus expected to exhibit a remarkably high effect of reducing a burden to environments in various industrial fields. Therefore, the present invention also has a high industrial value in this regard.

Problems solved by technology

Therefore, at the present time, reduction in thickness of these parts such as the intake manifold is possible only to a limited extent.
However, the 56-nylon tends to be insufficient in vibration-welding strength, and further deteriorated in retention heat stability, and, therefore, is unsuitable for large-size molded products requiring a long molding cycle time such as intake manifolds.
Therefore, the hinged molded products produced from the 66-nylon tend to suffer from breakage upon bending.
However, it is considered that the resin composition of this type fails to exhibit an improved heat resistance (melting point).
Also, there is known the method of blending the polyamide resin with a polyolefin such as polypropylene and polyethylene (for example, refer to Patent document 4 However, the polyamide resin composition of this type tends to be deteriorated in heat resistance (melting point) or mechanical properties such as bending modulus as compared to those of the polyamide resin.
Therefore, the polyamide resin composition tends to be deficient in rigidity as an important mechanical property.
However, as described above, the 56 nylon tends to be deteriorated in vibration-welding strength and retention heat stability.
However, there are conventionally unknown hinged molded products produced from the 56 nylon.

Method used

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  • Polyamide Resin and Hinged Molded Product
  • Polyamide Resin and Hinged Molded Product
  • Polyamide Resin and Hinged Molded Product

Examples

Experimental program
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Effect test

example 1

Polyamide Resin Composition and Vibration Welded Molded Product

[0102] 25 kg of water was added to 25 kg of a mixture containing the equimolar salt of pentamethylenediamine and adipic acid and the equimolar salt of hexamethylenediamine and adipic acid (as to the weight ratio therebetween, refer to Table 1), and then 1.25 g of phosphorous acid was added thereto to completely dissolve the mixture under a nitrogen atmosphere, thereby obtaining a raw material aqueous solution. The thus obtained raw material aqueous solution was transported into an autoclave previously purged with nitrogen using a plunger pump. By adjusting a jacket temperature and a pressure in the autoclave to 280° C. and 1.47 MPa, respectively, the contents of the autoclave were heated to 270° C. Next, the inside pressure of the autoclave was gradually released and further reduced to terminate the reaction at the time at which the agitation power reached a predetermined value. After completion of the reaction, the ins...

reference example 1

[0104] The same procedure as defined in Example 1 was conducted except that the composition of monomers charged in the raw salts was changed as shown in Table 1, thereby obtaining a polyamide resin. The thus obtained polyamide resin was blended with a glass fiber by the same method as defined in Example 1, thereby obtaining a glass fiber-reinforced polyamide resin composition. The thus obtained polyamide resin composition was subjected to vibration-welding test and evaluation of mechanical properties thereof. The results are shown in Table 1.

example 2

Polyamide Resin Composition, Hinged Molded Product and Binding Band

[0105] 100 parts by weight of the polyamide resin obtained in Example 1 was blended with 0.02 part by weight of talc as a nucleating agent having an average particle size of 3.0 μm and then dry-blended, thereby obtaining a non-reinforced polyamide resin composition. The thus obtained polyamide resin composition was subjected to evaluation of a low-temperature hinge property, a low-temperature band breaking property and mechanical properties thereof. The results are shown in Table 2.

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Abstract

A polyamide resin comprising a dicarboxylic acid constitutional unit comprising an adipic acid unit and a diamine constitutional unit comprising a pentamethylenediamine unit and a hexamethylenediamine unit wherein a weight ratio of the pentamethylenediamine unit to the hexamethylenediamine unit being in the range of 95:5 to 60:40; a vibration-welded molded product having an excellent vibration welding strength, a hinged molded product and a binding band having an excellent low-temperature toughness, and a filament having an excellent transparency which are obtained from the polyamide resin; and a hinged molded product comprising a polyamide resin constituted of an adipic acid unit and a pentamethylenediamine unit.

Description

TECHNICAL FIELD [0001] The present invention relates to a polyamide resin, and more particularly to a polyamide resin comprising an adipic acid unit, a pentamethylenediamine unit and a hexamethylenediamine unit as constitutional components thereof which can be produced by using raw materials that are free from generation of carbon dioxide (CO2) causing global warming problems; and a vibration-welded molded product having an excellent vibration welding strength, a hinged molded product and a binding band having an excellent low-temperature toughness, and a filament having an excellent transparency which are produced from the polyamide resin. Further, the present invention relates to a hinged molded product, and more particularly to a hinged molded product obtained from a polyamide resin that is more excellent in hinge property and heat resistance (melting point) than those of 6-nylon, and simultaneously has a good rigidity (bending modulus) equal to or higher than that of 6-nylon. BA...

Claims

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Application Information

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Patent Type & Authority Applications(United States)
IPC IPC(8): C08G69/26C08L77/00D01F6/80C08G69/28C08L77/06C12N15/00C12P13/00
CPCC08G69/265C08K7/04C12P13/001C12P13/02D01F6/80C08L77/06
Inventor MIYAMOTO, MASAAKIHITOMI, TATSUYANISHIDA, YUUICHI
Owner MITSUBISHI CHEM CORP
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