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Water-disintegrable composite fiber and method for producing the same

a composite fiber and water disintegration technology, applied in the direction of yarn, melt spinning methods, transportation and packaging, etc., can solve the problems that single fibers of polylactic acid resins or polyglycolic acid resins cannot be considered to have sufficient water disintegrability or mechanical characteristics, and the short fibers remain in the ground after well treatment, etc., to achieve high proppant dispersibility

Inactive Publication Date: 2015-10-08
KUREHA KAGAKU KOGYO KK
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Benefits of technology

The present invention allows for a special fiber that can be easily dissolved in water and maintain its shape in a well treatment fluid. This improves the ability of the fiber to keep the treatment fluid mixed together even when it flows through the well.

Problems solved by technology

However, conventional short fibers added to a well treatment fluid consist of a resin such as a polyamide or polyolefin which is hardly decomposed in the ground, resulting in the problem that the short fibers remain in the ground after well treatment.
However, single fibers of a polylactic acid resin or a polyglycolic acid resin cannot necessarily be considered to have sufficient water disintegrability or mechanical characteristics, and the conjugation of single fibers with various resins has been studied (for example, Japanese Unexamined Patent Application Publication No.

Method used

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  • Water-disintegrable composite fiber and method for producing the same
  • Water-disintegrable composite fiber and method for producing the same
  • Water-disintegrable composite fiber and method for producing the same

Examples

Experimental program
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working example 1

[0086]A PGA / PLA composite undrawn yarn was produced by using the melt spinning device illustrated in FIG. 2. A temperature-controllable heat sleeve 5 with a length of 150 mm and an inner diameter of 100 mm was mounted beneath a spinneret 4 for composite fibers of the melt spinning device. In the following explanations and drawings, elements that are identical or equivalent are labeled with the same symbols, and duplicate explanations will be omitted.

[0087]First, a pellet-formed PGA resin (made by the Kureha Corporation, weight average molecular weight: 180,000, glass transition temperature: 43° C., melting point: 220° C., melt viscosity (temperature: 240° C., shear rate: 122 sec−1: 790 Pa·s, size: 3 mm in diameter×3 mm in length) was loaded into a single-screw extruder 2a (made by Plagiken Co., Ltd., cylinder diameter: 30 mm, L / D=24) from a raw material hopper la and melted at 215 to 250° C. The cylinder temperature of the extruder 2a was set to 215 to 250° C., and the adapter tempe...

working example 2

[0092]A core-sheath type PGA / PLA composite undrawn yarn (core part: PGA resin, sheath part: PLA resin) was produced in the same manner as in Working Example 1 with the exception of regulating the volume of the molten PGA resin and the molten PLA resin so that the cross-sectional area ratio of the core part to the sheath part of the discharge port was core part / sheath part=35 / 65. The content of the PGA resin in the resulting core-sheath type PGA / PLA composite undrawn yarn is 5.7 parts by mass per 1 part by mass of the D-lactic acid units in the PLA resin.

[0093]A core-sheath type PGA / PLA composite drawn yarn (core part: PGA resin, sheath part: PLA resin) was then produced in the same manner as in Working Example 1 with the exception of changing the draw ratio to 2.5 times, and a core-sheath type PGA / PLA staple fiber (core part: PGA resin, sheath part: PLA resin) was further produced. The single fiber fineness of the resulting PGA / PLA composite drawn yarn and the mass loss and proppant...

working example 3

[0094]A core-sheath type PGA / PLA composite undrawn yarn (core part: PGA resin, sheath part: PLA resin) was produced in the same manner as in Working Example 1 with the exception of regulating the volume of the molten PGA resin and the molten PLA resin so that the cross-sectional area ratio of the core part to the sheath part at the discharge port was core part / sheath part=50 / 50. The content of the PGA resin in the resulting core-sheath type PGA / PLA composite undrawn yarn is 10.5 parts by mass per 1 part by mass of the D-lactic acid units in the PLA resin.

[0095]A core-sheath type PGA / PLA composite drawn yarn (core part: PGA resin, sheath part: PLA resin) was then produced in the same manner as in Working Example 1 with the exception of changing the draw ratio to 2.5 times, and a core-sheath type PGA / PLA staple fiber (core part: PGA resin, sheath part: PLA resin) was further produced. The single fiber fineness of the resulting PGA / PLA composite drawn yarn and the mass loss and proppan...

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Abstract

A water-disintegrable composite fiber comprising a phase containing a polyglycolic acid resin and a phase containing a polylactic acid resin with a D-lactic acid unit ratio of at least 1.0%; the two phases extending continuously in a lengthwise direction; and the composite fiber having a cross sectional area formed by the phase containing the polyglycolic acid resin having an area ration of at most 50%; and the content of the polyglycolic acid resin being from 2 to 100 parts by mass per 1 part by mass of the D-lactic acid units in the polylactic acid resin.

Description

TECHNICAL FIELD[0001]The present invention relates to a water-disintegrable composite fiber and a method for producing the same, and particularly to a water-disintegrable composite fiber containing a polyglycolic acid resin and a polylactic acid resin and a method for producing the same.BACKGROUND ART[0002]In drilling techniques such as those used in gas fields or oil fields, short fibers are added to a well treatment fluid so as to prevent the backflow of proppants inside the well (for example, see Japanese Unexamined Patent Application Publication (Translation of PCT Application) No. 2011-506791 (Patent Document 1)). However, conventional short fibers added to a well treatment fluid consist of a resin such as a polyamide or polyolefin which is hardly decomposed in the ground, resulting in the problem that the short fibers remain in the ground after well treatment. Therefore, in recent years, the use of fibers consisting of a biodegradable resin as short fibers for a well treatment...

Claims

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Application Information

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IPC IPC(8): D01F8/14D01D5/26D01D5/08D01F6/62
CPCD01F8/14D01F6/625D01D5/26Y10T428/2931D10B2331/041Y10T428/2929D01D5/08D01D5/084C09K2208/08C09K8/035
Inventor TAKAHASHI, TAKEOCHIBA, YUKITOSHIYAMAZAKI, MASAHIROSATO, HIROYUKI
Owner KUREHA KAGAKU KOGYO KK
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