EPDM rubber foaming material and moulding method

A technology of EPDM rubber and foaming materials, which is applied in the field of polymer materials, can solve problems such as poor product performance uniformity, narrow process window, and difficult to precisely control the size of sealing rings, and achieve good surface conditions, good stability, and energy saving. The effect of the secondary bonding process

Inactive Publication Date: 2017-12-05
NO 53 RES INST OF CHINA NORTH IND GRP
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Affected by uneven mold temperature when processing large-sized sealing rings, it is difficult to precisely control the size of the sealing ring, the process window is narrow, and the product performance uniformity is poor, so it can only be used for the processing of small-sized sealing rings

Method used

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  • EPDM rubber foaming material and moulding method
  • EPDM rubber foaming material and moulding method
  • EPDM rubber foaming material and moulding method

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0026] Add EPDM rubber MITSUI EPT 4045M (ethylene content: 45%, ENB content: 7.6%) 90 parts, EPDM rubber Vistalon 2727 (ethylene content: 56.5%, ENB content: 2%) to the internal mixer 70 parts, masticated (3-5) min, add 5 parts of zinc oxide, 0.8 parts of stearic acid, knead, then add 40 parts of quick-pressed furnace black, 30 parts of naphthenic oil, 40 parts of paraffin oil, and finally add hygroscopic Add 4 parts of agent (CaO-80) and 8 parts of gelatin, mix for about 10 minutes to remove the glue, and quickly move it to the open mill, knives back kneading for 2 to 3 minutes, and then remove the piece to obtain a section of mixed rubber.

[0027] After a section of the mixed rubber is mixed and rolled on the open mill, 1.2 parts of foaming agent H, 0.4 parts of foaming aid diethylene glycol and tetramethylthiuram disulfide of the low-temperature vulcanization system are added in sequence while cutting. (TMTD) 0.8 parts, diphenylmethiazole disulfide (DM) 1.0, high-temperatu...

Embodiment 2

[0031] Add 100 parts of EPDM Nordel IP 4570 (ethylene content: 50%, ENB content: 4.9%) and EPDM Keltan 4869C (ethylene content: 64%, ENB content: 8.7%) to the internal mixer 60 parts, masticated (3-5) min, add 3 parts of zinc oxide, 0.5 parts of stearic acid, knead, and then add 40 parts of quick press furnace black, 40 parts of high wear-resistant carbon black and 30 parts of naphthenic oil, 10 parts of paraffin oil, finally add 8 parts of hygroscopic agent (HC-08) and 10 parts of gelatin, knead for about 10 minutes to remove glue, and quickly move to the open mill, knives back for 2 to 3 minutes and then remove the slices to obtain A section of rubber mix.

[0032] After mixing a section of rubber on the open mill and wrapping the rolls, add 2.2 parts of foaming agent H, 1.6 parts of foaming aid urea grease (BK-1) and low-temperature vulcanization system 4,4' in sequence while cutting. - 0.6 parts of dimorpholine disulfide (DTDM), 1.2 parts of diphenylmethiazole disulfide (...

Embodiment 3

[0036] Add 160 parts of EPDM Nordel IP 4570 (ethylene content: 50%, ENB content: 4.9%) to the internal mixer, masticate (3-5) min, add 8 parts of zinc oxide and 3 parts of stearic acid , mixing, then add 30 parts of quick press furnace black, 20 parts of high wear-resistant carbon black, 30 parts of naphthenic oil, 30 parts of paraffin oil, 20 parts of dioctyl sebacate (DOS), and finally add moisture absorbent (CaO -80) 2 parts and 2 parts of glue Yisu, mixed for about 10 minutes to remove the rubber, and quickly moved to the open mill, knives back kneaded for 2 to 3 minutes, and then sliced ​​to obtain a section of mixed rubber.

[0037] After a section of the mixed rubber is mixed and rolled on the open mill, 1.0 parts of foaming agent H, 0.8 parts of foaming aid urea grease (BK-1) and low-temperature vulcanization system diamyl tetrasulfide are added in sequence while cutting. 1.3 parts of thiuram (DPTT), 1.5 parts of zinc dimethyl dithiocarbamate (PZ), 2.2 parts of dimethy...

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Abstract

The invention belongs to the technical field of high-molecular materials. Through combination of high-temperature foaming system and a low-temperature foaming system and two-stage vulcanization technology of pressure vulcanization and non-pressure foaming vulcanization, micro-foaming micro-nucleuses and high-temperature foaming vulcanization are realized. The EPDM rubber foaming material at least comprises the following ingredients (by weight): 160 parts of EPDM rubber, 3-10 parts of zinc oxide, 0.5-3 parts of stearic acid, 40-80 parts of a strengthening agent, 30-80 parts of a plasticizer, 0.6-2.2 parts of a low-temperature vulcanizing agent, 0.8-2.4 parts of a high-temperature vulcanizing agent, and 0.8-2.2 parts of a foaming agent. The EPDM rubber foaming material has advantages as follows: foaming is uniform; surface state is good; pressure change, hardness and low-temperature performance of the material can be designed and regulated according to requirements; and the product has good dimensional stability and high controllability. The moulding method is suitable for whole compression moulding of large-size foam sealing rings with low pressure change, low hardness and low temperature resistance and having requirements on dimension and appearance.

Description

technical field [0001] The invention belongs to the technical field of polymer materials, and relates to formula design of foamed rubber materials and products and product molding technology, in particular to EPDM foamed materials and molding technology thereof. technical background [0002] It is used for the sealing of hatch doors of vehicles, ships, machinery and other equipment. It has the characteristics of high compression rate and adaptability to large deformation. The foam sealing ring is usually processed by extruding foam rubber strips and bonding into a ring. Small corners are bent Wrinkles are prone to occur at the joints and cause seal failure, and weak points at the joint bonding will reduce the reliability of the seal. [0003] To solve the above problems, the best solution is to integrally form a foam rubber sealing ring of a specific shape through a mold according to the structure of the installation groove. However, the schematic diagram of the vulcanizati...

Claims

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Application Information

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IPC IPC(8): C08L23/16C08L91/00C08L91/06C08K13/02C08K3/22C08K5/09C08K3/04C08J9/10
CPCC08J9/107C08J2323/16C08J2423/16C08J2491/00C08J2491/06C08K2201/014C08L23/16C08L2203/14C08L2205/02C08L2205/025C08L2205/03C08L2205/035C08L2312/00C08L91/00C08L91/06C08K13/02C08K2003/2296C08K5/09C08K3/04
Inventor 邹德广张春梅杜华太杜明欣崔俞温家亮宫志欣尤丛赋马伟超庞明磊张斌张志刚
Owner NO 53 RES INST OF CHINA NORTH IND GRP
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