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Non-blending type ACM water swelling rubber and mass polymeriatio preparing method thereof

A technology of water-swelling rubber and polyacrylate, which is applied in the field of polymer synthesis and performance, can solve the problems of no chemical bond connection, poor adaptability, performance degradation, etc., and achieves simple and easy operation, good structural stability, and mechanical strength. Good results

Active Publication Date: 2014-09-24
QINGDAO UNIV OF SCI & TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Compared with the blend type, since the hydrophilic group is chemically bonded to the polymer main chain, the compatibility and strength of the water-swellable rubber are improved, but there is no fundamental change
[0005] Whether it is physical blending or chemical grafting water-absorbing swelling rubber, there is poor compatibility between the two phases, or there is no chemical bond connection, or only a small amount of chemical bond connection, and the internal structure stability is poor. After long-term use, the water-absorbing resin is precipitated and water-absorbing swelling rate drop problem
[0006] As we all know, the mass loss rate of blended water-swellable rubber after water absorption is higher than that of grafted type, but the mass loss rate of grafted water-swellable rubber is also higher, such as: water-swellable rubber prepared by in-situ grafting of sodium acrylate to nitrile rubber The mass loss rate is 6~15wt%, therefore, it is difficult for these water-swelling rubbers to absorb water repeatedly, and the performance will decline rapidly after absorbing water once
Due to the poor durability of the existing water-swellable rubber, the adaptability is not wide, and it cannot meet the requirements of some special environments

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0030] The preparation method of the non-blended high-stability polyacrylate water-swellable rubber described in this embodiment comprises the following steps:

[0031] (1) Mix 72g of ethyl acrylate, 19g of acrylic acid, 6g of trimethylolpropane, and 3g of ethanol evenly, transfer all the materials to the reaction device, pass nitrogen to exhaust oxygen for 30 minutes, heat to 60°C, and add 0.54g of peroxide Benzoyl (BPO) initiator, then add 0.46g N,N-dimethylaniline initiator, react for 8 hours, obtain solid resin.

[0032] (2) The obtained solid resin was heated to 80° C. for 24 hours, and then to 120° C. for 4 hours to obtain a cross-linked resin.

[0033] (3) Soak the cross-linked resin in 5% aqueous sodium hydroxide solution to neutralize the carboxyl group to form a salt. The soaking time is 1 hour and the soaking temperature is 80°C. The product was taken out, washed with deionized water until neutral, and dried to obtain polyacrylate water-swellable rubber.

[0034] ...

Embodiment 2

[0037] The preparation method of the non-blended high-stability polyacrylate water-swellable rubber described in this embodiment comprises the following steps:

[0038] (1) Mix 68g of ethyl acrylate, 14g of acrylic acid, 5.5g of trimethylolpropane, 2.5g of ethanol and 10g of montmorillonite evenly, transfer all the materials to the reaction device, blow nitrogen and oxygen for 30 minutes, and heat to 60°C Finally, add 0.54g of benzoyl peroxide (BPO) initiator, then add 0.46g of N,N-dimethylaniline initiator, react for 8 hours to obtain a solid resin.

[0039] (2) The obtained solid resin was heated to 80°C for 12 hours, then to 120°C for 4 hours to obtain a cross-linked resin.

[0040] (3) Soak the cross-linked resin in 5% aqueous sodium hydroxide solution to neutralize the carboxyl group to form a salt. The soaking time is 1 hour and the soaking temperature is 80°C. The product was taken out, washed with deionized water until neutral, and dried to obtain polyacrylate water-s...

Embodiment 3

[0044] The preparation method of the non-blended high-stability polyacrylate water-swellable rubber described in this embodiment comprises the following steps:

[0045] (1) Mix 77g of butyl acrylate, 5g of glycidyl methacrylate, 10g of acrylic acid, 6g of butanediol, and 2g of ethanol evenly, transfer all the materials to the reaction device, blow nitrogen for 30 minutes, and heat to 70°C , add 0.65g benzoyl peroxide (BPO) initiator, then add 0.55g N,N-dimethylaniline initiator, react for 16 hours to obtain solid resin.

[0046] (2) The obtained solid resin was heated to 80°C for 16 hours, and then to 140°C for 2 hours to obtain a cross-linked resin.

[0047] (3) Soak the cross-linked resin in 5% aqueous sodium hydroxide solution for 3 hours, and the soaking temperature is 40°C. The product was taken out, washed with deionized water until neutral, and dried to obtain polyacrylate water-swellable rubber.

[0048] The properties of the water-swellable rubber prepared by the pr...

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Abstract

The invention provides non-blending type ACM water swelling rubber and a mass polymeriatio preparing method of the non-blending type ACM water swelling rubber. The non-blending type ACM water swelling rubber is prepared through the mass polymeriatio preparing method, the troublesome technology process that an emulsion polymerization needing to removing water, a redox initiator is used for the mass polymerization, the cross-linked ACM water swelling rubber can be obtained, then neutralization is performed to obtain salt, and the ACM water swelling rubber containing sodium acrylate is obtained. Hydrophilic groups on molecular chains of the water swelling rubber is obtained, and an evener structure is obtained compared with a chemical grafting method and a physical blending method; as the hydrophilic groups can not be separated from the rubber main chains, the structure is better in stability, capable of achieving repeated water swelling and low in mass loss.

Description

technical field [0001] The invention belongs to the field of polymer synthesis and performance, and in particular relates to a non-blended polyacrylate water-absorbing swelling rubber and a bulk polymerization preparation method thereof. Background technique [0002] At present, there are two main methods for the preparation of water-swellable rubber: physical blending and chemical grafting. [0003] Water-swellable rubber prepared by physical blending is a water-swellable rubber obtained by physically blending rubber and water-absorbent resin. This method has simple preparation process, wide sources of raw materials, and low cost. However, the strong polar water-absorbing resin itself has a large cohesion, poor dispersion and poor compatibility in rubber, and the water-absorbing resin is easily separated from the rubber after soaking in water. Repeated use Post-expansion and tensile strength decreased. [0004] The chemical grafting method to prepare water-absorbing swell...

Claims

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Application Information

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IPC IPC(8): C08F220/18C08F220/32C08F4/40C08K3/34C08K3/22C08K3/36C08F8/44C08J3/24
Inventor 魏燕彦石耀东杜秀才
Owner QINGDAO UNIV OF SCI & TECH
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