Thermoplastic water-swellable elastomer and preparing method and application thereof

A water-swelling and elastic body technology, which is applied in chemical instruments and methods, and other chemical processes, can solve problems such as the fields that limit the application of water-swelling rubber, the decline in mechanical properties, and the degradation of product performance, and achieve good batch preparation feasibility, Ease of processing and good fatigue resistance

Inactive Publication Date: 2015-06-10
EAST CHINA UNIV OF SCI & TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0004] On the other hand, since the rubber matrix is ​​generally non-polar hydrophobic and the water-absorbing components are mostly hydrophilic components, the compatibility between the two components is poor, which reduces the performance of the molded product, especially After water swelling, part of the water-absorbing components will be precipitated, and the mechanical properties will be significantly reduced, which severely limits the application field of water-absorbing swelling rubber, so that it can only be used in simple water blocking or low-pressure working environments

Method used

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  • Thermoplastic water-swellable elastomer and preparing method and application thereof
  • Thermoplastic water-swellable elastomer and preparing method and application thereof

Examples

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Effect test

Embodiment 1

[0022] (1) Before the experiment, 100 parts by weight of thermoplastic elastomer, 30 parts by weight of sodium polyacrylate water-absorbing material and 5 parts by weight Bake W 501NC ionomer resin at 90°C for 4 hours.

[0023] (2) At room temperature, 100 parts by weight of thermoplastic elastomer and 0.5 part by weight of antioxidant were mixed in a high-speed mixer for 5 minutes at a speed of 800 rpm to obtain an initial mixture.

[0024] (3) The premix was then added to an internal mixer at 180°C for 20 minutes of melt mastication, followed by adding 5 parts by weight of ionomer resin W 501NC melted and sheared for 10 minutes; finally added 30 parts by weight of sodium polyacrylate and kneaded for 15 minutes to obtain a kneaded product; the kneaded product was added to a single-screw extruder again for secondary plasticization and cooling and cutting pellets at a temperature of 180° C. and a rotational speed of 60 rpm to obtain a high-performance thermoplastic water-swe...

Embodiment 2

[0037] (1) Before the experiment, 100 parts by weight of thermoplastic elastomer, 30 parts of sodium polyacrylate water-absorbing material and 7 parts Bake W 501NC ionomer resin at 90°C for 4 hours.

[0038] (2) At room temperature, 100 parts by weight of thermoplastic elastomer and 0.5 part by weight of antioxidant were mixed in a high-speed mixer for 5 minutes at a speed of 900 rpm to obtain an initial mixture.

[0039] (3) Then add the premix into the internal mixer at 180°C for 20 minutes of melt mastication, then add 7 parts of ionomer resin AMPLIFY IO 3701 for 10 minutes of melt shearing; finally add sodium polyacrylate 30 Parts by weight, mixed for 15 minutes to obtain a mixed rubber; the mixed product was added to the single-screw extruder again for secondary plasticization and cooling and pelletizing, the temperature was 180 ° C, and the rotational speed was 60 rpm to obtain high-performance thermoplastic Water-swellable elastomer.

[0040](4) Inject the sample str...

Embodiment 3

[0051] (1) Before the experiment, 100 parts by weight of thermoplastic elastomer, 30 parts of sodium polyacrylate water-absorbing material and 10 parts Bake W 501NC ionomer resin at 90°C for 4 hours.

[0052] (2) At room temperature, 100 parts by weight of thermoplastic elastomer and 0.5 part by weight of antioxidant were mixed in a high-speed mixer for 5 minutes at a speed of 1000 rpm to obtain a primary mixture.

[0053] (3) Then add the premix into the internal mixer at 195°C for 20 minutes of melt mastication, then add 10 parts of ionomer resin AClyn for 10 minutes of melt shearing; finally add 30 parts by weight of sodium polyacrylate , mixed for 15 minutes to obtain a mixed rubber; the mixed product was added to the single-screw extruder again for secondary plasticization and cooled and pelletized at a temperature of 190 ° C and a rotational speed of 60 rpm to prepare a high-performance thermoplastic water expandable elastomer.

[0054] (4) Inject the sample strips fo...

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Abstract

The invention relates to a thermoplastic water-swellable elastomer and a preparing method and application thereof and belongs to the technical field of rubber products. The thermoplastic elastomer is used for water resistance, leaking stoppage and sealing. Water-swellable rubber comprises, by weight, 100 parts of thermoplastic elastomer, 20-60 parts of water absorbing material, and 1-20 parts of ionomer resin. The preparing method of the water-swellable elastomer comprises the steps of conducting plastication and fusion on the thermoplastic elastomers, adding the water absorbing materials and ionomer resin in the plasticated object for shearing blending, and conducting secondary plastication to obtain the high-performance thermoplastic water-swellable elastomer. The water-swellable elastomer has excellent mechanical property and can expand by multiple times or even hundred of times of the mass or volume of itself after absorbing water, preparing process is simple and continuous, large-scale production can be achieved, and repeated forming and machining can be achieved.

Description

technical field [0001] The invention belongs to the technical field of rubber products, and in particular relates to a thermoplastic water-absorbing swelling elastomer with high performance and repeatable molding processability, a preparation method and application thereof. Background technique [0002] Water-swellable Rubber (WSR for short) is a new type of functional polymer material, which is prepared by adding a certain amount of water-absorbing materials and other fillers to the rubber or thermoplastic elastomer matrix. Rubber has high elasticity and fast water absorption capacity, and it still has strong water retention capacity under external extrusion. When WSR contacts with water, it can absorb water molecules into the rubber matrix, expand the volume, and generate expansion pressure. It plays the role of water-stopping and leak-stopping, that is, the dual water-stopping characteristics of water-absorbing water-blocking and water-absorbing-swelling water-stopping. ...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C08L53/02C08L55/02C08L75/04C08L23/00C08L23/08C08L67/00C08L3/02C08L1/02C08L33/02B29B7/28B29C45/76C09K3/12
Inventor 吴唯李宁
Owner EAST CHINA UNIV OF SCI & TECH
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