Expanded polyhydroxyalkanoate resin bead, molded object thereof, and process for producing the expanded resin bead

A technology of expanded particles and hydroxybutyrate, applied in the field of polyhydroxyalkanoate resin expanded particles, can solve problems such as narrow processing width, and achieve the effects of excellent water resistance and excellent environmental adaptability

Inactive Publication Date: 2008-10-29
KANEKA CORP
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, there are problems such as post-shrinkage after molding and narrow processing width during molding.

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0089] Alcaligenes eutrophus (J. Bacteriol., 179, 4821 (1997) ) is 95 parts by weight of PHBH with a HH rate of 12 mole %, 5 parts by weight of PHB, and 4 parts by weight of a polyisocyanate compound (Nippon Polyurethane, millionate (Millionet) MR-200 (isocyanate group 2.7-2.8 equivalents / mole)) was manually mixed, and then melted at a barrel temperature of 145°C using a φ35mm single-screw extruder with a kneader (Kasamatsu Kasa Experimental Universal Extruder) Kneading, and cutting the monofilament extruded by the small hole die of 3 mmφ installed at the front end of the extruder with a granulator to make PHBH resin composition A with a particle weight of 5 mg and a melting temperature of 135° C. At a shear rate of 122sec -1 , The melt viscosity of the resin composition A at 150° C. (=Tm1+15° C.) was 7600 Pa·s.

[0090] After putting 100 parts by weight of this resin composition A into a 4.5L pressure-resistant container, add 25 parts by weight of isobutane as a foaming age...

Embodiment 2

[0093] It carried out similarly to Example 1 except having made the addition number of the polyisocyanate compound in PHBH resin composition A 3 parts by weight, and having implemented at 131 degreeC the container internal temperature at the time of foaming. At a shear rate of 122sec -1 , 150 DEG C (=Tm1+15 DEG C), the melt viscosity of resin composition A is 6200Pa·s, it is used for foaming, obtains the PHBH resin foaming that expansion ratio is 28 times, independent cell rate is 96% Particle B. In addition, the gel fraction of the expanded PHBH resin particles B was 95%. Furthermore, water vapor of 0.17-0.30 MPa (gauge pressure) was introduced, heated and melted to obtain a PHBH resin foamed molded body C with an expansion ratio of 29 times and an independent cell rate of 92%. In addition, the PHBH resin foam molding C was not shrunk at all after the production, and the PHBH resin foam molding C with good appearance such as surface properties was obtained. The results are...

Embodiment 3

[0095] Except having used only PHBH resin, it carried out similarly to Example 1. At a shear rate of 122sec -1 , 150 DEG C (=Tm1+15 DEG C), the melt viscosity of resin composition A is 5630Pa·s, it is used for foaming, obtains the PHBH resin foaming that expansion ratio is 13 times, independent cell rate is 99% Particle B. In addition, the gel fraction of the expanded PHBH resin particles B was 49%. Furthermore, water vapor of 0.23-0.35 MPa (gauge pressure) was introduced, heated and fused to obtain a PHBH resin foamed molded body C with an expansion ratio of 14 and a closed cell ratio of 99%. In addition, although the PHBH resin foam molding C shrinks slightly after production, the PHBH resin foam molding C having good appearance such as surface properties was obtained. The results are shown in Table 1.

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PUM

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Abstract

An object of the present invention is to provide expanded polyhydroxyalkanoate resin beads which are satisfactory and have biodegradability, the molded product thereof, and process for producing the expanded resin beads. The object can be achieved by expanded poly(3-hydroxyalkaonate) (abbreviatedtoP3HA) resin beads obtained from a P3HA resin composition comprising: a copolymer which comprises repeating units of one or more kinds represented by the formula (1): [-O-CHR-CH 2 -CO-] (wherein R is alkyl represented by CnH2n+1, provided that n is an integer of 1 to 15) and is yielded by a microorganism (this copolymer is P3HA); and an isocyanate compound, and having a melt viscosity of 500Pas or higher when examined under the conditions of a shear rate of 122 sec -1 and a temperature of from Tm1 to Tm2, wherein Tm1 is the melting temperature of the P3HA resin composition and Tm2=Tm1+20 DEG C, provided that Tm2<180 DEG C.

Description

technical field [0001] The present invention relates to a plant-derived, biodegradable polyhydroxyalkanoate resin expanded particle, a molded product thereof, and a method for producing the resin expanded particle. Background technique [0002] Among plastic wastes, foamed plastics, which are used in large quantities for packaging containers, cushioning materials, shock absorbing materials, etc., are large in size and become a big social problem, which is desired to be solved. Therefore, research on biodegradable plastic foams has been active, and extrusion foams of aliphatic polyester resins or mixed resins of starch and plastics, etc., or in-mold foams using expanded particles have been carried out so far. Research on molded foams. [0003] As the prior art related to the use of expanded particles of biodegradable aliphatic polyester resin synthesized from petroleum-derived raw materials and its molded body, it is known to use organic peroxides and the like in order to im...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C08G18/42B29C44/00B29K75/00C08G101/00C08L101/16
CPCC08J9/18C08G18/4283C08J2375/06C08J2203/142C08J2203/14C08J2203/12C08G18/4202B29C44/3461
Inventor 宫川登志夫广瀬文信千田健一
Owner KANEKA CORP
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