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High-performance water swellable rubber and preparation method thereof

A water-swellable rubber, high-performance technology, applied in the field of rubber products, can solve problems such as hindering the use range of water-swelling rubber, restricting the development of water-swelling rubber, and decreasing mechanical properties, achieving controllable water-absorbing speed, mechanical properties and ion resistance. Strong, high expansion multiplier effect

Active Publication Date: 2013-05-08
PETROCHINA CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0008] (1) The compatibility between the rubber matrix and each component is relatively poor, which makes the performance of the vulcanized and molded product low, especially after water swelling, the mechanical properties drop significantly, which seriously limits the water swelling rubber. Development, it is limited that it can only be used in simple water blocking or working environment without high pressure;
[0009] (2) The expansion ratio of the prepared water-absorbing rubber in the acid and alkali plasma solutions is not enough, and the performance in the mixed solution with a relatively high salinity is low, which hinders the application range of the water-absorbing rubber

Method used

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  • High-performance water swellable rubber and preparation method thereof
  • High-performance water swellable rubber and preparation method thereof
  • High-performance water swellable rubber and preparation method thereof

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0033] Embodiment 1 Azide in-situ modified nitrile rubber (NBR) prepares water-swellable rubber

[0034]This embodiment provides the water-swellable rubber prepared with nitrile rubber (NBR) as the rubber matrix, as shown in Table 1, according to the raw materials and consumption (in parts by weight) of formula 1, formula 2 and formula 3 (comparative formula) Prepare water-swellable rubber, and its preparation method comprises the following steps:

[0035] At 25°C-50°C, first put the nitrile rubber into the open mill for plasticating for 5 minutes; then add sulfur, zinc oxide, stearic acid, anti-aging agent 4010, and water-absorbing resin (mainly composed of Sodium polyacrylate), white carbon black, azidotrimethylsilane (formulation 3 does not contain the azide coupling agent), and accelerator DM were mixed for 15-25 minutes to obtain a mixed rubber; at 160 ° C, Under the pressure of 15 MPa, the mixed rubber was vulcanized and molded in a flat vulcanizer, and the vulcanizatio...

Embodiment 2

[0044] Example 2: Preparation of water-swellable rubber by in-situ modification of chloroprene rubber (CR) with azide

[0045] This embodiment provides the water-absorbing swelling rubber prepared with chloroprene rubber (CR) as the rubber matrix. Prepare water-swellable rubber, and its preparation method comprises the following steps:

[0046] Put the chloroprene rubber (CR) into the open mixer for 5 minutes at room temperature to 70°C; then add zinc oxide, stearic acid, and water-absorbing resin (mainly composed of sodium polyacrylate) into the open mixer in sequence , white carbon black, azidotrimethylsilane (prescription 3 does not contain the azide coupling agent), sulfur, accelerator CZ and accelerator TMTD were mixed for 15-25 minutes to obtain the compound glue; at 150 ℃, 15MPa, the mixed rubber was vulcanized and molded in a flat vulcanizer, and the vulcanization time was 45 minutes to prepare a standard 2mm thick water-swellable rubber test piece.

[0047] Table 4 ...

Embodiment 3

[0055] Example 3: Preparation of water-swellable rubber by in-situ modification of natural rubber (NR) with azide

[0056] This example provides water-swellable rubber prepared with natural rubber (NR) as the rubber matrix, as shown in Table 7, prepared according to the raw materials and dosage (in parts by weight) of formula 1, formula 2, and formula 3 (comparative formula) Water-swellable rubber, its preparation method comprises the following steps:

[0057] At 45-55°C, first put natural rubber (NR) into the open mill for plasticating for 5 minutes; then add zinc oxide, stearic acid, water-absorbing resin (mainly composed of sodium polyacrylate), and White carbon black, azidotrimethylsilane (formulation 3 does not contain the azide coupling agent), sulfur, accelerator CZ and accelerator TMTD are mixed for 15-25 minutes to obtain a rubber compound; , 15MPa, vulcanize and mold the mixed rubber in a flat vulcanizer, and the vulcanization time is 25 minutes to prepare a standar...

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Abstract

The invention relates to a high-performance water swellable rubber and a preparation method of the water swellable rubber. The water swellable rubber comprises the following raw materials in parts by weight: 100 parts of a rubber matrix, 1-5 parts of a nitrine coupling agent, 20-60 parts of a water absorbing material and 10-80 parts of a filling agent. The preparation method of the water swellable rubber comprises the following steps of: plasticating the rubber matrix so as to obtain plasticated rubber; subsequently adding the rest materials except for the rubber matrix into the plasticated rubber according to the sequence that small materials are added firstly, large materials are added secondly, and liquid, a vulcanizing agent and an accelerant are added at last, so as to obtain a rubber compound; vulcanizing the rubber compound and preparing so as to obtain the high-performance water swellable rubber. The high-performance water swellable rubber has excellent mechanical properties and high swelling performance, is simple in process of the preparation method, lower in production cost and wide in application range, and is particularly suitable for being used as a sealing material in a working environment of an oil field under high-temperature and high-pressure condition.

Description

technical field [0001] The invention relates to a high-performance water-absorbing swelling rubber and a preparation method thereof, belonging to the technical field of rubber products. Background technique [0002] Water Swellable Rubber (WSR for short) is a new type of functional polymer material first developed by Japan in the late 1970s. WSR is made by introducing hydrophilic groups or components into traditional elastic matrices (such as rubber and thermoplastic elastomers). The product can expand to several times or even hundreds of times its own mass or volume after absorbing water. It can adapt to structural deformation and generate greater expansion pressure. While maintaining the elasticity and strength of the matrix, it also has the ability to retain and stop water. [0003] The preparation method of water-swellable rubber mainly contains the following two types: [0004] (1) Physical blending method: According to the blending method, it can be divided into two ...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C08L9/02C08L11/00C08L23/16C08L23/28C08L7/00C08K5/544C08K5/548C08K3/36C08K3/04
Inventor 刘德铸张洪君朱富林王今宇赵峰刘卫红刘玉文郑亮周坤李彪王斌曹建陈建王昊常鹏梅姜韦韦马培静曲玉辰周贺高言涛苑启生周飞戴倩倩王国雨王思辉韩冬深
Owner PETROCHINA CO LTD
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