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Polyamide resin composition

A technology of polyamide resin and composition, which is applied in the field of polyamide resin composition, and can solve problems such as the inability to obtain a uniformly dispersed resin composition and the inability to fully improve the properties of the resin composition

Active Publication Date: 2017-10-13
UNITIKA LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, in this method, since the cellulose is directly mixed in the resin in a state where the cellulose is aggregated, it is impossible to obtain a resin composition in which the cellulose is uniformly dispersed.
Therefore, the properties of the resin composition cannot be sufficiently improved

Method used

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  • Polyamide resin composition

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0071] [Adjustment of aqueous dispersion of cellulose fiber]

[0072] As the aqueous dispersion of cellulose fibers, CELISH KY110N (an aqueous dispersion containing 15% by mass of cellulose fibers having an average fiber diameter of 125 nm manufactured by Daicel FineChem Co., Ltd.) was used. Purified water was added to this aqueous dispersion and stirred with a mixer to prepare an aqueous dispersion having a cellulose fiber content of 3% by mass.

[0073] [melt polymerization]

[0074] 70 parts by mass of the obtained aqueous dispersion of cellulose fibers and 100 parts by mass of ε-caprolactam were further stirred and mixed with a mixer until a uniform dispersion was obtained. The pressure was raised to 240° C. over 4 hours while stirring the mixed dispersion liquid while controlling the pressure at 0.7 MPa. Then the pressure was released to atmospheric pressure, and melt polymerization was carried out at 240°C for 0.5 hours.

[0075] After the end of the melt polymerizati...

Embodiment 2～8、 comparative example 2

[0080] [melt polymerization]

[0081] Compared with Example 1, the content of cellulose fibers, whether or not to use a polymerization catalyst, its type and content, and reaction time were changed as described in Table 1. Except for this, melt polymerization was performed in the same manner as in Example 1.

[0082] After the end of the melt polymerization, the polyamide resin composition was taken out, cut and pelletized.

[0083] [Refining, solid state polymerization]

[0084] Using the obtained pellets, refining and solid phase polymerization were carried out in the same manner as in Example 1.

Embodiment 9

[0086] [Adjustment of aqueous dispersion of cellulose fiber]

[0087] Inject 50 mL of a culture medium consisting of 0.5% by mass glucose, 0.5% by mass polypeptone, 0.5% by mass of yeast extract, and 0.1% by mass of magnesium sulfate heptahydrate into a 200-mL Erlenmeyer flask. Perform steam sterilization at 120°C for 20 minutes. Gluconacetobacter xylinus (NBRC 16670) propagated on a test tube slant agar medium was inoculated with 1 platinum ear, and cultured statically at 30° C. for 7 days. After 7 days, white gel film-like bacterial cellulose was formed on the upper layer of the culture solution.

[0088] The obtained bacterial cellulose was pulverized with a mixer, then soaked in water and washed repeatedly to replace it with water to prepare an aqueous dispersion having a cellulose fiber content of 4.1% by mass. The average fiber diameter of the cellulose fibers was 60 nm.

[0089] [melt polymerization]

[0090] Compared with Example 1, 24.4 parts by mass of the obtain...

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Abstract

The invention provides a polyamide resin composition. This polyamide resin composition contains 0.01-50 parts by mass of cellulose fibers for every 100 parts by mass of a polyamide resin, has a relative viscosity of 2.3 or greater, and, in a Lab color space, has an 'L' value of 20 or greater, an 'a' value of 10 or less and a 'b' value of 20 or less. This polyamide resin composition is obtained by solid-phase polymerization of a polyamide resin composition that has a relative viscosity of 2.2 or less.

Description

technical field [0001] The present invention relates to a polyamide resin composition comprising cellulose fibers and a polyamide resin and having a good color tone despite high viscosity, in other words, high degree of polymerization and high strength. Background technique [0002] Resin compositions in which polyamide resins are reinforced with inorganic fillers such as glass fibers, carbon fibers, talc, and clay are widely known. However, when reinforcing materials composed of these inorganic fillers are used, there is a problem that the mechanical properties and heat resistance will not be improved unless a large amount is added, and there is a problem that the mass of the obtained resin composition becomes large due to the high specific gravity. [0003] In recent years, the use of cellulose as a reinforcing material for resin materials has been studied. Cellulose includes cellulose obtained from trees; cellulose obtained from non-wood resources such as rice, cotton, k...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C08L77/00C08G69/06C08L1/02
CPCC08L1/02C08K2003/329C08L77/02C08K7/02C08K3/32C08G69/06C08L2205/16C08L2314/00
Inventor 中井美穗熊泽颂平池本健二
Owner UNITIKA LTD
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