Poly(3-hydroxyalkanoate) composition and molded object thereof

A technology of hydroxyalkanoate and hydroxycaproate, which is applied in the field of poly(3-hydroxyalkanoate) composition and its molded body, can solve the problem of insufficient adhesion between polyester and vegetable fiber interface, Problems such as reduction in maximum bending strength, impact resistance, and impact resistance

Inactive Publication Date: 2006-12-20
KANEKA CORP
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

In addition, there is a description (Patent Document 4) that by mixing vegetable fibers with chemically synthesized aliphatic polyester, the fibers swell when exposed to moisture, and cracks are generated in the molded body, thereby easily biodegrading. In actual use, the molded body may be damaged due to water absorption, so it is not preferable
According to the information published by the society recently (Non-Patent Document 1), it is disclosed that when bamboo fiber, carbonized bamboo fiber, and surface-treated bamboo fiber are mixed with polybutylene succinate, which is a chemically synthesized polyester, although stretched, bent The modulus of elasticity and the maximum bending strength are improved, but there is a problem that the tensile strength and impact resistance are lowered, or when kenaf fibers are added to polylactic acid, which is a chemically synthesized aliphatic polyester, although the heat resistance is improved or crystallized Accelerated effect and improved flexural modulus, but there is a problem of decreased maximum flexural strength and impact resistance
In this way, although the strength or heat resistance can be improved by adding vegetable fibers to most chemically synthesized aliphatic polyesters, the impact resistance tends to decrease, which is considered to be due to the interface density between polyester and vegetable fibers. caused by insufficient compatibility

Method used

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  • Poly(3-hydroxyalkanoate) composition and molded object thereof
  • Poly(3-hydroxyalkanoate) composition and molded object thereof
  • Poly(3-hydroxyalkanoate) composition and molded object thereof

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0112] Alcaligenes eutrophus AC32 (J. Bacteriol., 179, 4821 (1997)) in which the PHA synthase gene from Aeromonas caviae was introduced into Alcaligenes eutrophus was used as the Microorganisms, 5 parts by weight of fibers dried with a heating dryer under the conditions of 60°C x 3 hours were added to 100 parts by weight of PHBH (HH ratio 8.4 mol%, Mw = 1,030,000) produced by appropriately adjusting the raw materials and culture conditions The kenaf fiber bundles with a length of 30 mm were mixed by hand, and then mixed with a uniaxial extruder with a kneader (a test universal extruder manufactured by Kasamatsu Co., Ltd. φ35 mm, granulation temperature: 150° C.) to obtain a combination. A1 particle (Mw=810,000).

[0113] The pellets of this composition A1 were injection-molded (80t injection molding machine manufactured by Toshiba, injection temperature: 140° C.) to produce a 1 / 4-inch dumbbell sheet (a good injection-molded body was obtained). For the dumbbell sheet made of t...

Embodiment 2

[0118] An injection-molded dumbbell sheet containing the composition A2 was obtained in the same manner as in Example 1, except that the addition amount of the kenaf fiber bundle was set to 10 parts by weight. The measurement results are shown in Table 1. By adding the kenaf fiber, the crystallization rate of the composition A2 was increased, the flexural modulus, the maximum flexural strength, and the IZOD impact value of the composition A2 were improved, and the heat resistance was also improved. Water resistance is also good.

Embodiment 3

[0120] An injection-molded dumbbell sheet containing the composition A3 was obtained in the same manner as in Example 1, except that the addition amount of the kenaf fiber bundle was set to 20 parts by weight. The measurement results are shown in Table 1. By adding kenaf fibers, the crystallization rate of the composition A3 was increased, the flexural modulus, the maximum flexural strength, the IZOD impact value, and the heat resistance of the composition A3 were improved compared with those without the addition. Water resistance is also good.

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Abstract

The present invention has for its object to obtain a composition and a molded product thereof excellent in processability, strength, impact resistance, heat resistance and water resistance and, when discarded, are biodegradable under the action of microorganisms and the like in an aerobic or anaerobic environment and, further, a plant origin composition and a molded product thereof, which can positively fix carbon dioxide on the earth. Such characteristics can hardly be attained with the above-mentioned chemically synthesized aliphatic polyesters or natural polymers such as starch. The present invention relates to a composition which comprises kenaf fibers and a poly(3-hydroxyalkanoate) produced by microorganisms and comprising a repeating unit represented by the formula (1): [-O-CHR-CH 2 -CO-] in the formula, R represents an alkyl group represented by C n H 2n+1 with n representing an integer of 1 to 15, and a molded product thereof.

Description

technical field [0001] The present invention relates to a plant-derived composition and a molded product excellent in processability, strength, impact resistance, heat resistance, and water resistance. In addition, it relates to a composition and a molded body of a carbon cycle system that is decomposed by the action of microorganisms or the like in an aerobic or anaerobic environment at the time of disposal and returned to the earth. In addition, it relates to a plant-derived composition that can actively absorb carbon dioxide through photosynthesis and convert it into carbohydrates, a molded product, and a molded product that is expected to prevent global warming. Background technique [0002] In the past, plastics have been used as disposable products due to their ease of processing or use, difficulty in recycling, and hygienic problems. However, with the large-scale use and disposal of plastics, attention has been paid to the problem of landfill disposal or incineration...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C08L67/04C08K7/02C08L99/00
CPCC08K7/02C08L99/00C08L67/04C08L2205/16C08L2666/26
Inventor 广瀬文信宫川登志夫千田健一野田泰司
Owner KANEKA CORP
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