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Preparation method of crosslinked low density polyethylene (LDPE)

A technology based on low-density polyethylene and octavinyl, applied to plastic/resin/wax insulators, organic insulators, etc., can solve problems affecting product performance, molecular chain extension, long cross-linking time, etc., to achieve convenient operation and cross-linking The effect of short linking time and high degree of crosslinking

Active Publication Date: 2015-01-14
ZHEJIANG UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0007] At present, although a new method of silane one-step crosslinking or room temperature crosslinking has been developed, there are still side reactions such as chain extension of molecular chains during the grafting process, which affects the performance of the product. At the same time, the crosslinking process relies on external Diffusion of water, there is a disadvantage of long crosslinking time

Method used

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  • Preparation method of crosslinked low density polyethylene (LDPE)
  • Preparation method of crosslinked low density polyethylene (LDPE)
  • Preparation method of crosslinked low density polyethylene (LDPE)

Examples

Experimental program
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Effect test

Embodiment 1

[0055] Take the L-0.5P-0.2D system (L stands for LDPE, P stands for OVPOSS, D stands for DCP, the overall meaning is LDPE containing OVPOSS 0.5%, DCP 0.2%) as an example:

[0056] (1) Mix anhydrous methanol, ultrapure water, and concentrated hydrochloric acid to obtain solution I; mix vinyltrimethoxysilane and anhydrous methanol to obtain solution II; add solution II dropwise to solution I, and hydrolysis and condensation reactions occur at 50°C 6d, after washing, filtering, and drying, and then through the process of product dissolution and reprecipitation, OVPOSS powder is obtained; the molar ratio of ultrapure water to vinyltrimethoxysilane is 5:1; the volume ratio of concentrated hydrochloric acid to solution I is 0.25:100; the volume ratio of vinyltrimethoxysilane to anhydrous methanol is 7:93;

[0057] (2) According to the mass ratio: LDPE 95% and DCP 5% were diffused and mixed at 80°C for 2 hours, and the mixture was extruded and granulated by a twin-screw extruder at 1...

Embodiment 2

[0064] Take the L-0.2P-0.2D system (LDPE containing OVPOSS 0.2%, DCP 0.2%) as an example:

[0065] (1) OVPOSS preparation method is identical with that in embodiment 1;

[0066] (2) According to the mass ratio: LDPE 95% and DCP 5% were diffused and mixed at 80°C for 2 hours, and the mixture was extruded and granulated by a twin-screw extruder at 100-120°C to obtain masterbatch 1.

[0067] (3) According to the mass ratio: LDPE 90% and OVPOSS 10% are extruded and granulated by a twin-screw extruder at 110-135°C to obtain masterbatch 2.

[0068] (4) 4% master batch 1, 2% master batch 2, and 94% LDPE are uniformly mixed according to the mass ratio, and then extruded, blended and granulated through twin-screws. The extrusion temperature in the twin-screw is 115-135°C, and the rotation speed is 40rpm. After extrusion, it is water-cooled and directly enters the pelletizer for granulation.

[0069] (5) Take an appropriate amount of sample in the mold, and press it into a disc-shaped...

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Abstract

The invention discloses a preparation method of crosslinked low density polyethylene (LDPE), which comprises the following step: under the condition of a free-radical initiator, carrying out crosslinking reaction on octafunctional cage-type oligomer silsesquioxane and LDPE to obtain the crosslinked LDPE. The crosslinked low density polyethylene is prepared from the following raw materials in percentage by mass: 98.5-99.6% of LDPE, 0.2-1% of octafunctional cage-type oligomer silsesquioxane and 0.2-0.5% of initiator. The functional group of the octafunctional cage-type oligomer silsesquioxane contains vinyl group. The invention also discloses a crosslinked LDPE prepared by the method and application thereof. By using the octafunctional cage-type oligomer silsesquioxane as the crosslinking agent, the peroxide crosslinking agent content in the traditional method is effectively lowered, thereby reducing the pores generated by chain-breaking reaction and peroxide decomposition. The prepared crosslinked LDPE has excellent mechanical properties and dielectric properties, and can satisfy the performance requirements for high-voltage cable materials.

Description

technical field [0001] The invention relates to the field of polyolefin preparation, in particular to a preparation method of cross-linked low-density polyethylene. Background technique [0002] Low-density polyethylene (LDPE) has non-polarity, chemical stability, easy processability and good electrical insulation properties, and is widely used in insulating cable materials. However, LDPE has a low melting point, low mechanical strength, and poor environmental stress cracking resistance, which limits its application in high-voltage cable materials. For this reason, in practical applications, LDPE molecules are often changed from a linear structure to a three-dimensional network structure by cross-linking, thereby effectively improving its tensile strength, thermal stability, weather resistance, dimensional stability, environmental stress cracking resistance and creep resistance. transsexual. Cross-linking increases the long-term use temperature from 70°C to 90°C. [0003]...

Claims

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Application Information

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IPC IPC(8): C08F255/02C08F230/08H01B3/44
Inventor 吴子良杨红梅吴佳春郑强
Owner ZHEJIANG UNIV
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