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Water-soluble PVA (polyvinyl alcohol) fiber as well as preparation method and application thereof

A fiber and dissolution temperature technology, applied in the chemical characteristics of fibers, chemical instruments and methods, rayon manufacturing, etc., can solve problems such as formation pollution and use restrictions, and achieve the effects of reducing damage, reducing dosage, and good degradable performance.

Active Publication Date: 2017-10-20
CHINA PETROCHEMICAL CORP +1
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Due to their own properties, these fibers are either difficult to be used in the field of oil and gas fields (such as oil and gas field cementing, oil and gas field fracturing temporary plugging construction, oil and gas field fracturing construction, etc.), or they are difficult to degrade and cause formation pollution, so their use is greatly restricted. limit

Method used

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  • Water-soluble PVA (polyvinyl alcohol) fiber as well as preparation method and application thereof
  • Water-soluble PVA (polyvinyl alcohol) fiber as well as preparation method and application thereof
  • Water-soluble PVA (polyvinyl alcohol) fiber as well as preparation method and application thereof

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0039] Embodiment 1: prepare water-soluble PVA fiber, main steps are as follows:

[0040] (1) Preparation of spinning stock solution: the degree of polymerization is 1600, the degree of alcoholysis is 95.0 (mol)% PVA and boric acid are dissolved in water and made into spinning stock solution, the mass concentration of PVA in the stock solution is 15%, boric acid is added The amount is 0.5% of the PVA mass, the stock solution is heated up to 105 ° C, and the pressure is maintained at 0.08 MPa, dissolved for 12 hours, then filtered, defoamed, and then enters the spinning process.

[0041] (2) Spinning: The PVA stock solution is sent to the spinning assembly by a metering pump, and the PVA stock solution is sprayed into the coagulation bath from the small hole of the spinneret. The composition of the coagulation bath is dimethyl sulfoxide and ethanol, the mass ratio of dimethyl sulfoxide and ethanol is 5:18, the temperature of the coagulation bath is 15°C, and the PVA stays in th...

Embodiment 2-10

[0044] Example 2-10: Referring to Example 1, operate according to the parameters in the following Attached Table 1 and Attached Table 2 to prepare Example 2-10. Explanation: In Attached Table 1 and Attached Table 2, DP means degree of polymerization, Ad means degree of polyvinyl alcoholysis, unit (mol / mol)%.

[0045] Schedule 1:

[0046]

[0047] Schedule 2:

[0048]

[0049]

Embodiment 11

[0051] This embodiment provides a fiber-containing guar gum fracturing fluid, the preparation method of which is as follows:

[0052] Step 1: under stirring condition, add 0.2 weight part of thickener hydroxypropyl guar gum (China Petroleum Substances Kunshan Company), 0.12 weight part of sodium carbonate, 0.1 weight part of potassium chloride to 100 weight parts of water, then stir for 20min, Obtain guar thickener aqueous solution;

[0053] Step 2: under stirring conditions, add 0.2 parts by weight of crosslinking agent aluminum nitrate to the above-mentioned thickener aqueous solution to obtain guar gum fracturing fluid (excluding fiber guar gum fracturing fluid);

[0054] Step 3: Add 0.5 parts by weight of the PVA fiber prepared in Example 1 to the above-mentioned guar gum fracturing fluid, cut the fiber to a length of 10 mm, add it to the oil and gas field fracturing fluid and disperse evenly, and obtain the fiber-containing guar gum fracturing fluid.

[0055] Step 4: Add...

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Abstract

A PVA (polyvinyl alcohol) fiber is prepared from PVA with polymerization degree being 1300-2600 and alcoholysis degree being 95.0(mol)%-99.5 (mol)%. The fiber has good water solubility, and can reduce the use amount of guanidine gum as a conventional thickener, reduce damage to strata and cannot cause new pollution to the environment when used in oil and gas fields. A preparation method is simple and suitable for industrial production.

Description

technical field [0001] The invention relates to PVA fibers, in particular to a PVA fiber and its preparation method and application. Background technique [0002] PVA (polyvinyl alcohol) fiber is a kind of fiber with excellent performance, which has the characteristics of high strength, high modulus, low elongation, etc., as well as excellent wear resistance, seawater corrosion resistance, weather resistance and good interface with the substrate It is widely used as nets for shallow sea laver cultivation, high-performance ropes, tire cords, industrial fabrics, cement reinforcement materials, plastic and rubber reinforcement materials, etc., and has broad market potential. [0003] In recent years, researchers at home and abroad have continued to carry out a lot of research on PVA fibers. CN200510057435A discloses a method for preparing high-performance polyvinyl alcohol fibers. The method uses a compound modifier composed of nitrogen-containing compounds, hydrophilic auxili...

Claims

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Application Information

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IPC IPC(8): D01F6/50D01F1/10D01F11/06C09K8/68
CPCC09K8/685C09K8/882C09K8/887C09K8/905D01F1/10D01F6/50D01F11/06
Inventor 王华全周霖张振宇刘禅向鹏伟
Owner CHINA PETROCHEMICAL CORP
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