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Application of polyamide alloy in preparation of pipelines and pipe fittings with flanges or wellhead seat products

A polyamide and flange technology is applied in the application field of polyamide alloy in the preparation of flanged pipe fittings or wellhead seat products, which can solve the problems of mechanical properties decline and slow development, and achieve the effect of convenient demoulding

Inactive Publication Date: 2009-11-18
湖北恒力新材料科技股份有限公司 +1
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, it is more sensitive to the influence of temperature and moisture
With the increase of temperature and humidity, its mechanical properties decrease. How to effectively improve the performance shortcomings of polyamide has been discussed for many years, but the development is very slow.

Method used

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  • Application of polyamide alloy in preparation of pipelines and pipe fittings with flanges or wellhead seat products

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0030] Preparation of pipes and fittings with flanges by polyamide alloy:

[0031] With 80 parts (weight parts are the same below) caprolactam, 4 parts of organic montmorillonite (MTA), 6 parts of glass fiber, 0.18 part of vinyl acetate, 0.2 part of carbon black, 0.2 part of phthalocyanine blue, 1.5 parts of toughening and plasticizing agent (hexamethylphosphoric triamide), the above materials are dry mixed in a blender first, and then poured into a reaction container for mixing. At a temperature of 120-130 ° C, blending and masticating for 10 minutes, vacuum (vacuum Negative pressure reaches 0.095MPa) Add 0.12 parts of sodium hydroxide, continue to blend and masticate for 25-30 minutes, the temperature is (140±5)°C, vacuum decompression (vacuum negative pressure is cancelled), and dehydrate to ≥720mm Hg 280PPm~290PPm, inject 0.04 parts of diphenylmethane diisocyanate, stir well, quickly cast into a mold preheated to (170±5)℃, rotate and centrifugally polymerize, stop after 20...

Embodiment 2

[0033] Preparation of pipes and fittings with flanges by polyamide alloy:

[0034] With 40 parts (by weight the same below) caprolactam, 2 parts of organic montmorillonite (MTA), 3 parts of active fly ash, 0.1 part of carbon black, 0.09 part of vinyl acetate, 0.1 part of phthalocyanine blue, 0.75 part of toughening Plasticizer HPT hexamethylphosphoric triamide, dry-mix the above materials in a blender first, then pour into a reaction container and knead. Negative pressure reaches 0.095MPa) Add 0.06 parts of sodium hydroxide, continue to blend and masticate for 25-30 minutes, the temperature is (140±5) ℃, vacuum decompression (vacuum negative pressure is cancelled), and dehydrated to ≥720mm Hg 280PPm~290PPm, inject 0.02 parts of diphenylmethane diisocyanate, stir well, quickly cast into a mold preheated to (170±5)℃, rotate and centrifugally polymerize, stop after 20~25 minutes, and cool naturally to 50~ At 60°C, the product can be obtained after demoulding.

Embodiment 3

[0036] Preparation of wellhead seat from polyamide alloy:

[0037] With 40 parts (weight parts are the same below) caprolactam, 2 parts of organic montmorillonite (MTA), 3 parts of polytetrafluoroethylene powder, 0.1 part of carbon black, 0.09 part of vinyl acetate following steps and [Example 2] reaction polymerization Shaped in the same way.

[0038] The performance data of poly [embodiment 1-3] gained material is listed in following table 1, table 2 now

[0039] Table 1

[0040] performance

unit

Example 1

Example 2

Example 3

experiment method

density

G / C m 2

1.41

1.26-

1.30

1.28

GB1033-1970

water absorption

％

0.22

0.35

0.75

GB1034-1970

Tensile Strength

MPa

135-155

95.6-

115

75.6

GB1040-1970

elongation at break

Rate

％

13.5-14.8

≥22

156

GB1040-1970

...

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Abstract

The invention relates to the application of a polyamide alloy in preparation of pipelines and pipe fittings with flanges or wellhead seat products, in particular to a method which uses the polyamide alloy material to produce pipelines and pipe fittings with flanges or wellhead seat products, and the products prepared. Filling enhancing modified materials are mixed into a caprolactam monomer for sufficient and even mixing, and then injected into a reactor. Active materials are prepared by melt dehydration, then a vinyl acetate copolymer is added for mixing, under the action of auxiliaries such as a catalyst and the like, the mixture is injected into a mold which is preheated to a certain temperature, and then aggregated and molded under the action of a centrifugal force. The pipelines and pipe fittings with flanges or oilfield wellhead seat products prepared by the polyamide alloy materials have the advantages of good mechanical property, 25 times of impact strength higher than that of the same types of mechanical blends, 5 times of break elongation rate, higher strength than that of some typical metals, excellent heat resistance, 2 to 3 times of moisture absorption performance lower than that of general polyamide, good flux and chemical resistance, excellent caustic corrosion, long service life and low cost.

Description

technical field [0001] The invention relates to the application of polyamide alloy in the preparation of flanged pipes, pipe fittings or wellhead products, in particular to a method for manufacturing flanged pipes, pipe fittings or wellhead seats with polyamide alloys and the prepared products. Background technique [0002] Polyamide is currently the most widely used type of engineering plastic, which can directly replace many non-ferrous metal materials, so it is widely used in petroleum, chemical, metallurgy and other industrial fields, and can also be used in automotive parts, mechanical parts, electrical appliances, electronic parts, and Nylon pipes, fittings, and manufactured industrial valves or pumps, among many other products. [0003] Although compared with other plastics, polyamide has higher tensile strength, excellent impact toughness and wear resistance. However, it is more sensitive to the influence of temperature and moisture. With the increase of temperatur...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): B29C41/04B29C41/52C08G69/14C08G69/16C08K13/04C08K7/14B29L31/00
Inventor 黄中南刘援朝黄晓丹
Owner 湖北恒力新材料科技股份有限公司