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Low-sag reinforced large-diameter polyethylene water supply pipe with lignin as functional carrier

A lignin, large-diameter technology, applied in the field of new pipes, can solve the problems of low mechanical properties and forming properties, poor polarity, sagging and other problems, and achieve the effect of excellent thermal fluidity

Active Publication Date: 2022-07-05
GUANGXI ACAD OF SCI +1
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, there is a large polarity difference between lignin and PE resin, resulting in low adhesion, and the phenomenon of "sagging" is more likely to occur during the production process. The large-diameter polyethylene water supply pipe produced has obvious mechanical properties and molding properties. Lower than PE water supply pipe with added glass fiber or carbon fiber

Method used

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  • Low-sag reinforced large-diameter polyethylene water supply pipe with lignin as functional carrier
  • Low-sag reinforced large-diameter polyethylene water supply pipe with lignin as functional carrier
  • Low-sag reinforced large-diameter polyethylene water supply pipe with lignin as functional carrier

Examples

Experimental program
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Effect test

Embodiment 1

[0046] A low-sag reinforced large-diameter polyethylene water supply pipe with lignin as a functional carrier, which includes the following raw material components in parts by mass: 100 parts of resin, 6 parts of modified lignin, 0.85 parts of compatibilizer, aromatic diols 0.8 part of chain extender, 1.0 part of antioxidant, 0.12 part of lubricant;

[0047] The preparation method of the modified lignin is to take the lignin and add it into deionized water to moisten it evenly to obtain a lignin paste, and the mass ratio of the lignin to the deionized water is 500g:2.5L; After the paste liquid was added to the container and sealed, it was placed in a high-pressure steam sterilizer at 105°C for 2 hours, and then the temperature of the steam sterilizer was lowered to room temperature. The mass ratio of lignin: lignin degrading enzyme: hemicellulose degrading enzyme was 500: 1.2: 0.3; then the container was resealed and placed in a constant temperature shaker at 30 °C for 48 h at...

Embodiment 2

[0055] A low-sag reinforced large-diameter polyethylene water supply pipe with lignin as a functional carrier, which includes the following raw material components in parts by mass: 100 parts of resin, 5.5 parts of modified lignin, 0.5 parts of compatibilizer, aromatic diols 0.3 part of chain extender, 1.5 part of antioxidant, 0.2 part of lubricant;

[0056]The preparation method of the modified lignin is to take the lignin and add it into deionized water to evenly wet it to obtain a lignin paste liquid, and the mass ratio of the lignin to the deionized water is 500g: 3L; then the lignin paste is mixed. After the liquid was added to the container and sealed, it was placed in a high-pressure steam sterilizer at 105°C for 1.75 hours, and then the temperature of the steam sterilizer was lowered to room temperature. The mass ratio of lignin: lignin-degrading enzyme: hemicellulose-degrading enzyme was 500:1:0.5; then the container was resealed and placed in a constant temperature s...

Embodiment 3

[0064] A low-sag reinforced large-diameter polyethylene water supply pipe with lignin as a functional carrier, which includes the following raw material components in parts by mass: 100 parts of resin, 6.5 parts of modified lignin, 1 part of compatibilizer, aromatic diols 0.75 part of chain extender, 1.2 part of antioxidant, 0.2 part of lubricant;

[0065] The preparation method of the modified lignin is to take the lignin and add it to deionized water to wet it evenly to obtain a lignin paste liquid, and the mass ratio of the lignin to the deionized water is 500g: 2L; then the lignin paste is mixed. After the liquid was added to the container and sealed, it was placed in a high-pressure steam sterilizer at 105°C for 1.5 hours, and then the temperature of the steam sterilizer was lowered to room temperature. The mass ratio of lignin: lignin-degrading enzyme: hemicellulose-degrading enzyme was 500:2:0.45; then the container was resealed and placed in a constant temperature shak...

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Abstract

The invention discloses a low-sag reinforced large-diameter polyethylene water supply pipe with lignin as a functional carrier. The low-sag reinforced large-diameter polyethylene water supply pipe is prepared from the following raw material components in parts by mass: 100 parts of resin, 4-7 parts of modified lignin, 0.5-1 part of a compatibilizer, 0.2-1 part of an aromatic diol chain extender, 0.5-1.5 parts of an antioxidant and 0.05-0.2 part of a lubricant, the preparation method of the modified lignin comprises the following steps: adding water into lignin to prepare lignin paste liquid, sterilizing at high temperature, adding lignin degrading enzyme and hemicellulolytic enzyme, adding phosphorous acid aqueous solution, and mixing to obtain enzymatic hydrolysis lignin; and mixing the enzymatic hydrolysis lignin with a powdered silane coupling agent to obtain the modified lignin. According to the invention, by regulating and controlling the microscopic phase interface between the lignin and the PE matrix and the crystallization condition of the composite material, the phenomenon of sagging during the forming of the large-diameter PE water supply pipe is improved, and the purposes of strengthening and toughening the large-diameter PE water supply pipe are achieved.

Description

technical field [0001] The invention belongs to the technical field of novel pipes, in particular to a low-sag reinforced large-diameter polyethylene water supply pipe with lignin as a functional carrier. Background technique [0002] Large-diameter polyethylene water supply pipe (diameter>110mm) is the fastest-growing plastic pipe in recent decades, and its performance and technical and economic indicators have obvious advantages in various pipes. At present, my country reports that the maximum diameter of PE water supply pipes that can be stably produced reaches 2500mm, but due to the relatively low strength of HDPE, it can only be used in lower pressure fields, and requires larger wall thickness. The larger the diameter of the water supply pipe, the higher the required pressure-bearing capacity and the thicker the pipe wall, often above 40mm. Existing extrusion production of PE pipes with a wall thickness of more than 40 mm is relatively difficult. Except for equipment...

Claims

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Application Information

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IPC IPC(8): C08L23/06C08L97/00C08L25/14C08K9/12C08K5/544C08K5/13C08K5/06B02C19/06B29C48/09C08H7/00C12P1/00
CPCC08L23/06B29C48/09B02C19/06C12P1/00C08H6/00C08L2203/18C08L2205/08C08L97/005C08L25/14C08K9/12C08K5/544C08K5/13C08K5/06
Inventor 黎演明陈兆伦刘忠林邓广昌龙思宇蓝俊
Owner GUANGXI ACAD OF SCI