Biodegradable copolyester nanometer composite material and temporary plugging agent prepared from biodegradable copolyester nanometer composite material

A technology of nanocomposite materials and inorganic nanomaterials, applied in the direction of single-component polyester rayon, rayon manufacturing, and drilling compositions

Inactive Publication Date: 2015-03-18
CHINA UNIV OF PETROLEUM (BEIJING)
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0013] The invention provides a degradable copolyester nanocomposite material, which adopts nano inorganic phase as a dispersed phase and a catalyst component in the copolymerization of polyester and polylactic acid to form a degradable copolyester nanocomposite material and prepare a temporary plugging agent thereby; The temporary blocking agent is a 30-75 μm powder made of degradable copolyester nanocomposite material or a short fiber product formed by spinning and cutting; the degradable copolyester nanocomposite temporary blocking ag

Method used

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  • Biodegradable copolyester nanometer composite material and temporary plugging agent prepared from biodegradable copolyester nanometer composite material
  • Biodegradable copolyester nanometer composite material and temporary plugging agent prepared from biodegradable copolyester nanometer composite material
  • Biodegradable copolyester nanometer composite material and temporary plugging agent prepared from biodegradable copolyester nanometer composite material

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0050] Take 300g of L-lactic acid and keep stirring in a 500ml three-necked flask. First, distill under reduced pressure for 2-4 hours at a temperature of 60-100°C and a vacuum of 6.5-3.5mmHg to remove free water and bound water in the raw materials; then add The catalyst is 1.52g of stannous octoate, and it is reacted for 6-10 hours at a temperature of 120-165°C and a vacuum of 2.5-1mmHg; finally, 4.91g of adipic acid is added to keep the reaction temperature at 165-170°C and a vacuum of 2.5 ~1mmHg, carry out the capping reaction for 4~6h to obtain the carboxyl-terminated lactic acid prepolymer with a viscosity-average molecular weight of 5836.

Embodiment 2

[0052] Based on the synthesis process parameters of Example 1, get 3000g of L-lactic acid, 12.31g of stannous octoate, and 49.98g of end-capping agent, and carry out the synthesis of carboxyl-terminated lactic acid prepolymer in a pilot scale reactor with a volume of 12L to obtain A carboxyl-terminated lactic acid prepolymer with a viscosity-average molecular weight of 5890.

Embodiment 3

[0054] Take 1,500g of terephthalic acid and 703ml of ethylene glycol in a 12L pilot test reactor under nitrogen protection to carry out esterification reaction for 3 hours with continuous stirring. The esterification temperature is 230-250°C and the esterification pressure is 0.23-0.28MPa. After completion, 0.78 g of antimony ethylene glycol and 0.70 g of triphenyl phosphate were added, and the polymerization reaction was carried out under the conditions of a vacuum of 0.05-1 mmHg and a temperature of 260-280 ° C. The intrinsic viscosity and melting point data of the obtained samples are shown in Table 1.

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Abstract

The present invention discloses a biodegradable copolyester nanometer composite material and a temporary plugging agent prepared from the biodegradable copolyester nanometer composite material. The biodegradable copolyester nanometer composite material is characterized in that a poly ethylene terephthalate esterification intermediate or ethylene terephthalate, a carboxyl-terminated lactic acid prepolymer and an inorganic nanometer material are subjected to in situ copolymerization to obtain the biodegradable copolyester nanometer composite material, wherein the intrinsic viscosity of the biodegradable copolyester nanometer composite material is 0.3-2.0 dl/g, the viscosity-average molecular weight is 10000-60000, the glass transition temperature is 60-90 DEG C, the melting point is 130-270 DEG C, and the 80 DEG C hydrothermal degradation rate is greater than 90%; and the biodegradable copolyester nanometer composite material is prepared into the powder or short fibers adopted as the temporary plugging agent for the oil and gas exploration project, wherein the temporary plugging agent produces effects of automatic plugging relieving, oil-gas reservoir protecting, oil-gas production efficiency increasing and yield increasing after the temporary plugging agent forms the temporary plugging layer in the oil-gas layer pore channel; and the biodegradable copolyester nanometer composite material has characteristics of high intrinsic viscosity, excellent original mechanical property, controllable degradation process, and wide and efficient application.

Description

technical field [0001] The invention belongs to the technical field of polymer materials and polymer composite materials, and in particular relates to a preparation method of a degradable copolyester nanocomposite material and the application of a temporary plugging agent prepared therefrom in the exploitation of oil and gas reservoirs. Background technique [0002] Polyethylene terephthalate (PET) has become one of the world's largest polymers due to its excellent mechanical properties and cost advantages. In the classification of polymer plastics, the code name of PET is No. 1. Extremely wide, it can be spun into polyester fiber for textile field, and can also be made into film for recording, video, movie film, etc., and can also be blown into various beverage bottles, etc. Mechanical parts, illuminator housings and other electrical fields. Such a large amount of polyester molecular chain materials with a wide range of polymer chains has a benzene ring structure that is d...

Claims

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Application Information

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IPC IPC(8): C08G63/60C08K3/22C08K3/36C08K3/26D01F6/92D01F1/10C09K8/502
Inventor 柯扬船宋有志
Owner CHINA UNIV OF PETROLEUM (BEIJING)
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