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Polyglycolic acid resin composition, and method for producing same

A technology of resin composition and polyglycolic acid, which is applied in the field of polyglycolic acid resin composition, can solve the problems of molecular weight reduction, difficulty in extension molding, etc., and achieve the effects of high-quality moldability, excellent heat resistance, and easy manufacture

Active Publication Date: 2015-06-03
KUREHA KAGAKU KOGYO KK
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0004] However, due to the hydrolyzability of PGA, which is the source of biodegradability, the molecular weight decreases during melt processing, and in addition, it is difficult to use for a long time in a high-temperature and high-humidity environment
In addition, due to the fast crystallization rate of PGA, thick ripples are formed on the molded product; or when it is composited with other thermoplastic resins, it is difficult to perform stretch molding, etc. question

Method used

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  • Polyglycolic acid resin composition, and method for producing same

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0126] From the main supply port, PGA small particles are supplied to a two-screw extruder with a diameter (D) of 48 mm. The two-screw extruder is manufactured by Japan Placon Co., Ltd. The PGA small particles are manufactured by KUREHA Co., Ltd., Mw: 200 , 000, Mw / Mn: 2.2, MFR: 10g / 10 minutes, Tg: 43°C, Tm: 220°C, diameter 3mm x length 3mm, melted at a temperature of 200-240°C. In addition, as an inorganic filler, silica sand was supplied to a twin-screw extruder from a side supply port, and PGA and silica sand were melt-kneaded at a temperature of 240 to 250°C. Among them, the silica sand is: JFEmineral Co., Ltd., Sunshine silica sand, registered trademark No. 8, and the side supply port is: relative to the cylinder length (L) of the two-screw extruder, it is set at the side of the screw drive unit. From about 0.6L position. The content ratio of PGA and silica sand in the PGA composition was: 50% by mass: 50% by mass. The PGA and silica sand that have been melted and knead...

Embodiment 2

[0128] Evaluation test pieces were produced in the same manner as in Example 1 except that the inorganic filler was changed to talc, and the content ratio of PGA and talc was 70% by mass: 30% by mass. Among them, the talc is: manufactured by Nippon Talc Co., Ltd., registered trademark micro-ace L-1, with an average particle size of 5 μm, a moisture content of 0.2%, and an apparent density of 0.15 g / cm 3 , hereinafter referred to as "Talc 1". The test results of the prepared evaluation test piece at 120°C for 3 hours, mass reduction rate, load deflection temperature, MFR, Charpy impact strength, tensile strength and elongation ratio, flexural strength and flexural modulus are shown in Table 1 . In addition, after the evaluation test piece of the PGA composition was buried in the soil at a temperature of 60°C for two months, it was dug out for visual judgment, and it was found that the evaluation test piece was completely damaged, so it was judged that the PGA composition had b...

Embodiment 3

[0130] In addition to changing the inorganic filler to talc, the method of supplying the inorganic filler, talc 2, to the twin-screw extruder is as follows: 30% by mass of the total amount of talc from the main supply port, 70% by mass of the total amount of talc from Evaluation test pieces were produced in the same manner as in Example 1 except that the side supply ports were provided separately. Among them, the talc is: manufactured by Nippon Talc Co., Ltd., Shimugon average particle size 8 μm, moisture content 0.2%, apparent density 0.29 g / cm 3 , hereinafter also referred to as "Talc 2". The test results of the prepared evaluation test piece at 120°C for 3 hours, mass reduction rate, load deflection temperature, MFR, Charpy impact strength, tensile strength and elongation ratio, flexural strength and flexural modulus are shown in Table 1 . In addition, after the evaluation test piece of the PGA composition was buried in the soil at a temperature of 60°C for two months, it...

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Abstract

A polyglycolic acid resin (PGA) composition which can be used as a packaging material or a material for a drilling downhole tool (member), said composition comprising 30 to 90 mass% of a PGA and 70 to 10 mass% of an inorganic filler, wherein the percentage of mass loss of the PGA after the immersion of the composition in water at a temperature of 120˚C for 3 hours is 20% or more, preferably 25% or more, and the deflection temperature under load of the composition is 120˚C or higher; and a method for producing a PGA composition, said method comprising a step of melt-kneading using an extruder.

Description

technical field [0001] The present invention relates to a polyglycolic acid resin composition comprising a polyglycolic acid resin which is a biodegradable resin, which is excellent in moldability and mechanical properties, and has excellent heat resistance and hydrolysis properties, and a method for producing the same. Background technique [0002] Aliphatic polyesters such as polyglycolic acid resin, hereinafter referred to as "PGA" and polylactic acid resin, hereinafter referred to as "PLA" are used as a Biodegradable polymer materials with less environmental impact are attracting attention. In addition, aliphatic polyesters are also used as medical polymer materials such as surgical sutures and artificial skin due to their biodegradable and absorbable properties. [0003] Even among aliphatic polyesters, PGA not only has excellent mechanical strength, but also has excellent gas barrier properties such as oxygen barrier properties, carbon barrier properties, and water va...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C08L67/04C08J3/20C08K3/00C08L101/16
CPCC08J2367/04C08K3/34C08J3/203C08L67/04C08K3/36
Inventor 三枝孝拓铃木智
Owner KUREHA KAGAKU KOGYO KK
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