A kind of polyvinyl alcohol masterbatch-polylactic acid composite fiber and use thereof

A polyvinyl alcohol masterbatch, polyvinyl alcohol technology, applied in the chemical characteristics of fibers, conjugated synthetic polymer man-made filaments, the composition of drilling holes, etc., can solve the problem that good fibers and composite materials cannot meet the requirements of multiple heat drawing The problems such as stretching and inability to further prepare performance, etc., can achieve the effect of short flowback time, significant production increase effect, and improved flowback rate.

Active Publication Date: 2020-05-08
CHINA PETROCHEMICAL CORP +1
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

[0005] Chinese patent, thermoplastic polyvinyl alcohol-polylactic acid blend material and its preparation method (CN201310128678.3), studied the blending modification of polyvinyl alcohol and polylactic acid to prepare melt-processable composite materials, but the composite materials prepared by this method cannot To meet the needs of multiple thermal stretching, it cannot be further prepared into fibers with good properties

Method used

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  • A kind of polyvinyl alcohol masterbatch-polylactic acid composite fiber and use thereof
  • A kind of polyvinyl alcohol masterbatch-polylactic acid composite fiber and use thereof

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0052] Example 1: Add 10 parts (weight) of amide compounds with a boiling point greater than 200°C to 90 parts (weight) of polyvinyl alcohol with a degree of polymerization of 1500 and a degree of alcoholysis of 95% (mol), at a temperature of 30 to 100°C Stirring and mixing for 10 hours, the mixed and modified polyvinyl alcohol is melted and extruded through a screw extruder, cooled to 20-40° C., and pelletized by a pelletizer to obtain a polyvinyl alcohol masterbatch.

[0053] Mix the above-mentioned polyvinyl alcohol masterbatch with 45 parts of polylactic acid at a temperature of 30-100°C for 0.5-4 hours, and then melt-extrude the blended modified product, pre-filter, spin, pre-stretch and coil , to obtain primary fibers, wherein the blended modified product is spun through a spinneret in a molten state, and the spinning temperature is 100-170 ° C. After spinning, the molten fluid is blown with gas, and the pre-stretching ratio is 3 times.

[0054] Then the as-spun fibers a...

Embodiment 2-6

[0056] Embodiment 2-6: See attached table 1 for specific conditions, and others are the same as embodiment 1.

Embodiment 7

[0057] Embodiment 7: The polyvinyl alcohol masterbatch-polylactic acid composite fiber described in any one of Embodiments 1-6 is used for oil and gas field fracturing fluid, and the amount of composite fiber added accounts for 0.5% of the total weight of the temporary plugging agent.

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Abstract

The invention discloses a polyvinyl alcohol master batch-polylactic acid composite fiber. The polyvinyl alcohol master batch-polylactic acid composite fiber is characterized by being prepared by co-blending and modifying a polyvinyl alcohol master batch and polylactic acid, and performing melt spinning, wherein a mass proportion of the polyvinyl alcohol master batch to the polylactic acid is (3 to 7) to (2 to 6), and the modified composite fiber contains a -NH-CO- radical. The polyvinyl alcohol-polylactic acid composite fiber has high water solubility, high strength, high dispersity in water, is more than or equal to 260cN / dtex in the modulus, is 10 to 20 percent in the fiber breakage elongation rate, and is up to level 1 in the fiber dispersion level; after an aqueous solution containing 5 percent of composite fiber is heated to 90 DEGC C and is kept at the temperature of 90 DEG C for 5 hours, the composite fiber can be dissolved by 35 to 60 percent; after an aqueous solution containing 5 percent of composite fiber is heated to 90 DEGC C and is kept at the temperature of 90 DEG C for 25 hours, the composite fiber can be dissolved by 99.5 to 100 percent.

Description

technical field [0001] The invention relates to a polyvinyl alcohol masterbatch-polylactic acid blended modified composite fiber and its application in the preparation of oil and gas field fracturing fluid, oil and gas field cementing agent and oil and gas field temporary plugging agent. Background technique [0002] Both polyvinyl alcohol and polylactic acid are degradable and environmentally friendly polymer materials, and the composite fibers are prepared by properly modifying and blending the two, which has a wide range of uses and has little environmental pollution. [0003] However, polyvinyl alcohol is a crystalline polymer with a large number of hydroxyl groups in the molecule, which can form a large number of intramolecular and intermolecular hydrogen bonds, making its melting point as high as 220-240°C, and its decomposition temperature is low. It starts dehydration at 160°C and begins to dehydrate at 200°C. Decomposition, the melting point of PVA is close to the d...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): D01F8/14D01F8/10D01F1/10C09K8/68C09K8/467C09K8/508
CPCC09K8/467C09K8/5086C09K8/68C09K8/885C09K2208/08D01F1/10D01F8/10D01F8/14
Inventor 向鹏伟周霖王华全冷平张振宇
Owner CHINA PETROCHEMICAL CORP
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