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 dur

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
Comparison scheme
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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