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Soluble fine-denier PVA (Polyvinyl Alcohol) fiber and purpose thereof

A soluble and fiber technology, applied in the direction of fiber chemical characteristics, synthetic polymer artificial filament chemical post-treatment, drilling composition, etc., can solve the problems of low linear density and good solubility, and achieve low linear density and dispersion Good sex, the effect of reducing dosage

Active Publication Date: 2017-10-24
CHINA PETROCHEMICAL CORP +1
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0004] However, the prior art has not found PVA fibers with low linear density and good solubility, and there are special requirements for the specific water melting temperature of the fibers and the dispersion performance of the fibers, such as the field of oil and gas fields.

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0043] Embodiment 1, adopts the following steps to prepare PVA fiber:

[0044] (1) Preparation of spinning stock solution: PVA with a degree of polymerization of 1700 and an alcoholysis degree of 99.0 (mol)% and a cross-linking agent are stirred and mixed in water to prepare a spinning stock solution. The mass concentration of PVA in the stock solution is 15%, the addition amount of the cross-linking agent is 1.5% of the mass of PVA, the stock solution is heated to 100 ° C, the pressure is maintained at 0.5 MPa, and the spinning process is started after dissolving for 5 hours. At this time, a part of the spinning stock solution was taken, cooled to 50°C, and its viscosity was tested to be 8000 mPa·s. The crosslinking agent is a combination of boric acid and aluminum chloride, and the molar ratio of boric acid and aluminum chloride is 3.5:1.8.

[0045] (2) Spinning: The PVA stock solution is pumped to the spinning assembly, and the PVA stock solution is spun from the small hol...

Embodiment 2

[0048] Embodiment 2, adopts the following steps to prepare PVA fiber:

[0049] (1) Preparation of spinning stock solution: PVA with a degree of polymerization of 2000 and an alcoholysis degree of 90.0 (mol)% and a cross-linking agent are stirred and mixed in water to prepare a spinning stock solution. The mass concentration of PVA in the stock solution is 14%, the addition amount of the cross-linking agent is 1.0% of the mass of PVA, the stock solution is heated to 100 ° C, the pressure is maintained at 0.6 MPa, and the spinning process is started after dissolving for 6 hours. At this time, a part of the spinning stock solution was taken, cooled to 50°C, and its viscosity was tested to be 12000 mPa·s. The crosslinking agent is a combination of boric acid and aluminum chloride, and the molar ratio of boric acid and aluminum chloride is 3.0:2.5.

[0050] (2) Spinning: The PVA stock solution is pumped to the spinning assembly, and the PVA stock solution is spun from the small ho...

Embodiment 3

[0053] Embodiment 3, adopts the following steps to prepare PVA fiber:

[0054] (1) Preparation of spinning stock solution: PVA with a degree of polymerization of 1300 and an alcoholysis degree of 99.9 (mol)% and a cross-linking agent are stirred and mixed in water to prepare a spinning stock solution. The mass concentration of PVA in the stock solution is 16%, and the addition amount of the cross-linking agent is 1.6% of the mass of PVA. The dope solution is heated to 100 °C, maintained at a pressure of 0.5 MPa, and dissolved for 5 hours before entering the spinning process. At this time, a part of the spinning stock solution was taken, cooled to 50°C, and its viscosity was tested to be 15000 mPa·s. The cross-linking agent is a combination of borax and aluminum chloride, and the molar ratio of borax and aluminum chloride is 2.8:1.5.

[0055] (2) Spinning: The PVA stock solution is pumped to the spinning assembly, and the PVA stock solution is spun from the small hole of the s...

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Abstract

The invention discloses a soluble fine-denier PVA (Polyvinyl Alcohol) fiber. The PVA fiber has the single-fiber linear density of 0.1dtex to 1.0dtex and the dry break strength which is greater than or equal to 4cN / detx, and has the property of being dissolved in water at 20 to 100 DEG C; the PVA fiber is made through the steps of the preparation of a spinning stock solution, the preparation of a nascent fiber and post treatment by adopting PVA with the polymerization degree of 1,000 to 2,500 and the alcoholysis degree of 88.0(mol)% to 99.9(mol)% as a raw material; the preparation of the spinning stock solution comprises the following steps of agitating and mixing the PVA with a cross-linking agent, then dissolving in the water, and confecting to be the spinning stock solution; the cross-linking agent is one or multiple of boric acid, borax, aluminum chloride, aluminum sulfate, zinc sulfate, copper sulfate, copper chloride and titanium chloride; the mass concentration, in the spinning stock solution, of the PVA is 10 percent to 20 percent; the addition amount of the cross-linking agent is 0.8 percent to 2.0 percent of the mass of the PVA. The PVA fiber provided by the invention is low in linear density and good in dispersity which can reach a grade 1; when being used in the fracturing of oil and gas fields, the fracturing temporary plugging of the oil and gas fields and the well cementation of the oil and gas fields, the fiber can be more uniformly dispersed in base fluid, so as to improve the fracturing, temporary plugging and well cementing performance of the soluble fine-denier PVA fiber.

Description

technical field [0001] The invention relates to a polyvinyl alcohol fiber, in particular to a soluble fine denier PVA fiber and its application. Background technique [0002] PVA fiber is a kind of polymer material with excellent performance. It has high fiber strength, contains a large number of hydroxyl structures in the molecule, and has excellent hydrophilic properties. PVA fiber has excellent acid and alkali resistance, light resistance, weather resistance and corrosion resistance. It is widely used as nets for shallow sea laver farming, high-performance ropes, tire cords, industrial fabrics, cement reinforcement materials, and plastic and rubber reinforcement materials, etc., and has broad market potential. If PVA fiber products can be further improved, it will play an important role in special fields such as oil and gas fields. [0003] In order to improve the performance of PVA fiber and expand its application field, researchers at home and abroad have carried out a...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): D01F6/50D01F1/10D01F11/06C09K8/68
CPCC09K8/685C09K8/882C09K8/887C09K8/905D01F1/10D01F6/50D01F11/06
Inventor 周霖冷平王建李海英刘婵
Owner CHINA PETROCHEMICAL CORP
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