Silane-grafted high-density polyethylene room-temperature cross-linking special material and preparation method thereof

A high-density polyethylene, room temperature cross-linking technology, applied in mechanical equipment, pipes/pipe joints/fittings, rigid pipes, etc., can solve the problem of short storage time of special materials, improve cross-linking uniformity, and save production costs Effect

Inactive Publication Date: 2011-11-16
HUANGSHAN JINGJIANG TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

The biggest disadvantage of the technology provided by this patent is that the storage time of special materials is relatively short

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0034] The preparation method of the silane cross-linked high-density polyethylene special material described in the comparative example of the present invention mainly comprises the following steps: (1) preparation of silane-grafted high-density polyethylene (A material):

[0035] (i) Formulation:

[0036] HDPE90

[0037] PE-g-MAH 10

[0038] Dicumyl peroxide 0.15

[0039] Vinyltrimethoxysilane 2.5

[0040] Antioxidant 168 0.2

[0041] Low molecular stearamide 1.5

[0042] (ii) Preparation route: Put all the raw materials in the formula into a high-speed mixer and stir at room temperature for 5 minutes at a high speed to obtain a compound, which is produced in a Φ65 co-rotating twin-screw extruder (length-to-length ratio L / D=44:1 ) in granulation. The obtained pellets were dried at 80° C. for 2 hours, and then vacuum-packed in an aluminum-plastic composite bag to be a finished product.

[0043] (iii) Parameter setting of co-rotating twin-screw:

[0044] The temperature ...

Embodiment 2

[0061] The preparation method of the silane cross-linked high-density polyethylene special material described in the comparative example of the present invention mainly comprises the following steps: (1) preparation of silane-grafted high-density polyethylene (A material):

[0062] (i) Formulation:

[0063] HDPE90

[0064] POE-g-MAH 10

[0065] Dicumyl peroxide 0.15

[0066] Vinyltrimethoxysilane 2.5

[0067] Antioxidant 168 0.2

[0068] Low molecular stearamide 1.5

[0069] (ii) Preparation route: put all the raw materials in the formula into a high-speed mixer and stir at room temperature for 5 minutes at a high speed to obtain a compound, which is produced in a Φ65 co-rotating twin-screw extruder (length-to-length ratio L / D=44:1 ) in granulation. The obtained pellets were dried at 80° C. for 2 hours, and then vacuum-packed in an aluminum-plastic composite bag to be a finished product.

[0070] (iii) Parameter setting of co-rotating twin-screw:

[0071] The first sta...

Embodiment 3

[0088] The preparation method of the silane cross-linked high-density polyethylene special material described in the comparative example of the present invention mainly comprises the following steps: (1) silane connection

[0089] The preparation of branch high-density polyethylene (A material):

[0090] (i) Formulation:

[0091] HDPE90

[0092] PE-g-MAH 10

[0093] tert-butyl peroxy-3,5,5-trimethylhexanoate 0.10

[0094] Vinyltrimethoxysilane 2.5

[0095] Antioxidant 168 0.2

[0096] Low molecular stearamide 1.5

[0097] (ii) Preparation route: put all the raw materials in the formula into a high-speed mixer and stir at room temperature for 5 minutes at a high speed to obtain a compound, which is produced in a Φ65 co-rotating twin-screw extruder (length-to-length ratio L / D=44:1 ) in granulation. The obtained pellets were dried at 80° C. for 2 hours, and then vacuum-packed in an aluminum-plastic composite bag to be a finished product.

[0098] (iii) Parameter setting o...

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Abstract

The invention relates to a silane-grafted high-density polyethylene room-temperature cross-linking special material and a preparation method thereof. The main preparation process of the special material comprises the following two steps: (1) preparing a silane-grafted high-density polyethylene material (material A); and (2) preparing a room-temperature cross-linking catalytic material (material B), wherein the material A comprises the following components in parts by weight: 70-90 parts of high-density polyethylene, 10-30 parts of carrier resin, 1-3 parts of unsaturated silane, 0.05-0.3 part of initiator, 0.1-0.5 part of antioxidant and 1-3 part of cross-linking aid; the material B comprises the following components in parts by weight: 70-90 parts of high-density polyethylene, 10-30 parts of carrier resin, 1-4 parts of catalyst, 1-3 parts of cocatalyst and 0.1-0.5 part of antioxidant; the raw materials are sufficiently mixed and granulated by a twin-screw extruder to obtain the material A and material B; and the special material is composed of the material A and the material B in a ratio of (90:10)-(95:5). Tubes manufactured from the special material can automatically achieve the cross-linking process after being placed at room temperature for 72 hours, with a cross-linking degree more than 65%. By using the special material provided by the invention, the cooking step of silane crosslinked polyethylene products in hot water is simplified, the production cost is saved, and the cross-linking uniformity of the products and the storage stability of the special material are improved.

Description

Technical field: [0001] The invention relates to a method for preparing silane-grafted high-density polyethylene room temperature cross-linking special materials for plastic pipes and metal composite pipes, especially a method for preparing silane-grafted high-density polyethylene by adding room temperature cross-linking assistants Methods. technical background: [0002] Special fluids, such as hot water, oil and natural gas, generally use various metal pipes, and metal pipes are not only bulky, but also may cause secondary pollution due to corrosion or scaling, resulting in waste of resources. At present, the materials that replace metal pipes are mainly PPR, HDPE, silane cross-linked HDPE or metal-plastic composite pipes, among which silane cross-linked HDPE is the most competitive pipe. There are mainly two steps in the production of silane crosslinked HDPE pipes: the first is a two-step method. Patent ZL02151548.4 introduces a silane cross-linked high-density polyethyl...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C08L51/06C08L23/06C08K5/524F16L9/12F16L9/147
Inventor 段景宽江文斌江建云
Owner HUANGSHAN JINGJIANG TECH
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