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Microwave vulcanized ethylene propylene diene monomer (EPDM) sponge sheath and processing method thereof

A technology of vulcanizing ternary and ethylene-propylene sponges. It is used in pipeline protection, hoses, and pipelines to prevent damage/wear. It can solve the problem of uneven distribution of sheath hardness, uneven distribution of open pores, and difficulty in controlling porosity problem, to achieve the effect of easy control of product size, good protection, and easy porosity

Inactive Publication Date: 2012-02-01
TIANJIN PENGYI GRP CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0002] At present, most of the sponge sheaths are processed by continuous vulcanization at normal pressure. This vulcanization method has high production efficiency and is easy to form sponge-like pores. Continuous vulcanization is vulcanized by high temperature, the rubber is porous from the outside to the inside, and it is easy to form open-cell bubbles with uneven distribution
Such an open cell structure makes the hardness distribution of the sheath uneven, and it is difficult to control the porosity

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0040] EPDM rubber 100 parts,

[0041] N539 60 copies,

[0042] 90 parts of light calcium carbonate,

[0043] 60 parts of paraffin oil,

[0044] White ointment 30 parts

[0045] 3 parts of rubber hygroscopic agent CaO,

[0046] Zinc oxide 6 parts,

[0047] 3 parts stearic acid,

[0048] 3 parts of polyethylene glycol,

[0049] 15 parts of azodicarbonamide,

[0050] 1 part of N-cyclohexyl-2-benzothiazolylsulfenamide,

[0051] 1.5 parts of dibenzothiazole disulfide,

[0052] 0.5 parts of tetramethylthiuram disulfide,

[0053] Sulfur 2 parts.

[0054] EPDM rubber is the main material of rubber, Mooney viscosity ML1+4 100℃≤70;

[0055] The EPDM sponge sheath produced by microwave vulcanization process is as follows:

[0056] 1) Extrusion of semi-finished products: the compounded rubber is extruded through the extruder, and the temperature of the extruder is set as follows: the temperature of the head is 80°C, the temperature of the screw section is 75°C, the temperatur...

Embodiment 2

[0061]EPDM rubber 100 parts,

[0062] N568 75 copies,

[0063] 80 parts of light calcium carbonate,

[0064] 70 parts of paraffin oil,

[0065] White ointment 35 parts

[0066] 5 parts of rubber hygroscopic agent CaO,

[0067] Zinc oxide 5 parts,

[0068] 2 parts stearic acid,

[0069] 2 parts polyethylene glycol,

[0070] 13 parts of azodicarbonamide,

[0071] 1.5 parts of N-cyclohexyl-2-benzothiazolylsulfenamide,

[0072] 1 part of dibenzothiazole disulfide,

[0073] 1 part of tetramethylthiuram disulfide,

[0074] Sulfur 1.5 parts.

[0075] The EPDM sponge sheath produced by microwave vulcanization process is as follows:

[0076] 1) Extrusion of semi-finished products: the compounded rubber is extruded through the extruder, and the temperature of the extruder is set as follows: the temperature of the head is 70°C, the temperature of the screw section is 65°C, the temperature of the plasticizing section is 55°C, and the temperature of the feeding section Carried ...

Embodiment 3

[0081] EPDM rubber 100 parts,

[0082] N550 90 copies,

[0083] 90 parts of light calcium carbonate,

[0084] 80 parts of paraffin oil,

[0085] White ointment 40 parts

[0086] 8 parts of rubber hygroscopic agent CaO,

[0087] Zinc oxide 4 parts,

[0088] 1 part stearic acid,

[0089] 1 part polyethylene glycol,

[0090] 10 parts of azodicarbonamide,

[0091] 2 parts of N-cyclohexyl-2-benzothiazolylsulfenamide,

[0092] 0.5 parts of dibenzothiazole disulfide,

[0093] 1.5 parts of tetramethylthiuram disulfide,

[0094] 1 part sulfur.

[0095] The EPDM sponge sheath produced by microwave vulcanization process is as follows:

[0096] 1) Extrusion of semi-finished products: the compounded rubber is extruded through the extruder, and the temperature of the extruder is set as follows: the temperature of the head is 60°C, the temperature of the screw section is 55°C, the temperature of the plasticizing section is 55°C, and the temperature of the feeding section Carried ...

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PUM

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Abstract

The invention relates to a microwave vulcanized EPDM sponge sheath and a processing method thereof. Rubber components for the sponge sheath comprise EPDM rubber, fast extruding carbon black, light calcium carbonate, paraffin oil, white factice, a dehumidifying and antifoaming agent, zinc oxide, stearic acid, polyethylene glycol, azodicarbonamide, N-cyclohexyl-2-benzothiazolesulfenamide, dibenzothiazyl disulfide, tetramethyl-thiuram disulfide and sulphur. According to the invention, mixed stock is extruded by an extruder which works under the condition that temperatures of a head, a screw section, a plasticizing section and a feeding section are set; microwave vulcanization is carried out by allowing a semi-finished product extruded by the extruder to directly enter into microwave vulcanizing equipment for vulcanization, with microwave total power maintained to be in range of 6000 to 8000 W, temperature of a microwave section set to be 200 DEG C, and temperature of a heating section set to be 200 to 220 DEG C from beginning to end. The invention enables a uniformly distributed closed pore bubble structure to be formed easily and dimension of a product to be controlled easily. Rapid heat generation of microwave enables vulcanization time to be reduced to some extend, thereby improving production efficiency.

Description

technical field [0001] The invention relates to the technical field of rubber hoses, in particular to a microwave vulcanized EPDM sponge sheath and a processing method. Background technique [0002] At present, most of the sponge sheaths are processed by continuous vulcanization at normal pressure. This vulcanization method has high production efficiency and is easy to form sponge-like pores. Continuous vulcanization adopts high temperature vulcanization, and the rubber is porous from the outside to the inside, and it is easy to form open-cell bubbles with uneven distribution. Such an open cell structure makes the hardness distribution of the sheath uneven, and it is difficult to control the porosity. [0003] Microwaves are used to heat the rubber, and the inside and outside of the product heat up at the same time. This makes it easier to control the foaming speed and porosity of the product by adjusting the formula and process, and it is also easy to form a uniformly dist...

Claims

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Application Information

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IPC IPC(8): C08L23/16C08K13/02C08K3/04C08K3/26C08K3/22C08K5/09C08K5/47C08K5/40C08K3/06C08J9/10F16L11/12F16L57/00B29C47/92B29C35/08B29C48/92
Inventor 张洪起郭翼
Owner TIANJIN PENGYI GRP CO LTD
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