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Three-layer composite pipe for use in water conservancy dredging and preparation method thereof

A layer composite and pipeline technology, which is applied in the field of polyamide alloy three-layer composite water conservancy dredging special pipeline, can solve the problems of slow development and mechanical performance decline, and achieve the effects of low water absorption, stable product size and long service life

Inactive Publication Date: 2010-09-15
黄中南
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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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Examples

Experimental program
Comparison scheme
Effect test

preparation example Construction

[0017] The raw materials for the preparation of the three-layer polymerization active materials all include polyamide monomers, filling and reinforcing modified materials, catalysts and co-catalysts. Among them, glass fiber, carbon black and phthalocyanine blue are used as filling and reinforcing modified materials for the preparation of raw materials for the outer wall of the pipeline; the catalyst is sodium metal or sodium hydroxide; and the co-catalyst is N-acyl caprolactam or diphenylmethane diisocyanate. The filling and strengthening modified materials for the preparation of the middle layer of the pipeline use organic montmorillonite, activated fly ash, carbon black and phthalocyanine blue; the catalyst is metal sodium or sodium hydroxide; the co-catalyst is diphenylmethane diisocyanate. The filling and strengthening modification of raw materials for preparing the inner wall of the pipeline uses nano-attapulgite clay, polytetrafluoroethylene powder and carbon black; the c...

Embodiment 1

[0027] Dry blend 80 parts (the same as parts by weight below) of polyamide monomer, 6 parts of glass fiber, 0.2 part of carbon black, and 0.2 part of phthalocyanine blue in a blender, and then inject them into a reaction vessel for mixing. For refining, blend and masticate for 10 minutes at a temperature of 120-130°C, vacuumize (vacuum negative pressure reaches 0.095MPa), add 0.12 parts of sodium hydroxide, continue blending and masticating for 25-30 minutes, and the temperature is (140±5 )°C, vacuum decompression (vacuum negative pressure cancelled), when ≥720mm Hg, dehydrate to 280PPm~290PPm, inject 0.04 parts of diphenylmethane diisocyanate, stir well, quickly cast into preheated to (170±5) In the mold at ℃, rotate and centrifugally polymerize for 3 minutes, and the outer wall of the pipe with a thickness of 4mm is polymerized.

Embodiment 2

[0029] With 40 parts (parts by weight are the same below) polyamide monomer, 2 parts of organic montmorillonite (MTA), 3 parts of activated fly ash, 0.1 part of carbon black, 0.1 part of phthalocyanine blue, the above materials are first mixed Dry blend in a mixer, then pour into a reaction container for mixing, at a temperature of 120-130°C, blend and masticate for 10 minutes, vacuumize (vacuum negative pressure reaches 0.095MPa), add 0.06 parts of sodium hydroxide, and continue blending and masticating 25-30 minutes, the temperature is (140±5) ℃, vacuum decompression (cancel vacuum negative pressure), when ≥ 720mmHg, dehydrate to 280PPm ~ 290PPm, inject 0.02 parts of diphenylmethane diisocyanate, stir well, quickly It is cast into the mold and covered on the formed outer wall, rotated and centrifuged for 3 minutes, and the middle layer of the pipe with a thickness of 4mm is polymerized.

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PUM

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Abstract

The invention relates to a three-layer composite pipe for use in water conservancy dredging, a preparation method thereof, and a prepared product. The outer layer of the three-layer composite pipe is polyamide / glass fiber reinforcing layer; the middle layer of the three-layer composite pipe is a polyamide / montmorillonite nano composite material layer; and the inner layer of three-layer composite pipe is a polyamide / nano attapulgite clay composite layer. The preparation method comprises: mixing different filling, reinforcing and modifying materials with a polyamide monomer, and stirring the mixture uniformly, filling the mixture in a reaction kettle, preparing an active material by dehydrating melts in the presence of assistants such as a catalyst, filling the active material by three times in a mould preheated to a certain temperature, and performing polymerization and forming under a centrifugal force. The three-layer composite pipe for use in water conservancy dredging of the invention, has high mechanical strength, physical performance, flux resistance, chemical resistance, high-temperature resistance and low-temperature resistance, as well as low hygroscopicity and long service life. The pipe can be used to manufacture pipes with thin walls, pipes with thick walls, annular pipes with multi-layer sandwich walls as well as straight pipes and pipe fittings which have a diameter of more than 400 millimeters. The pipe and the method of the invention make demoulding extremely convenient and are suitable for large-batch production.

Description

(1) Technical field [0001] The invention relates to a special pipeline for water conservancy dredging and a preparation method thereof, in particular to a method for using a polyamide alloy three-layer composite special pipeline for water conservancy dredging and the prepared product. (2) Background technology [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 temperature and...

Claims

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Application Information

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IPC IPC(8): F16L9/12C08L77/00B32B1/08B32B27/18B32B27/34
Inventor 黄中南刘援朝黄晓丹
Owner 黄中南