阅读说明：本技术 一种高强度、抗盐型吸水膨胀弹性体及制备方法 (High-strength salt-resistant water-swelling elastomer and preparation method thereof ) 是由 张磊 李绪锋 魏新芳 陈阳 王毅 高辉 张建国 马明新 邵茹 于 2020-07-06 设计创作，主要内容包括：本发明公开了一种高强度、抗盐型吸水膨胀弹性体的制备方法,各组分的重量份为：包含有按以下重量份数共混的组分及补强体系和硫化体系：弹性体100～120份,耐盐吸水树脂20-40份,硫酸钡及氧化锌5-7份,硬脂酸1-2份,喷雾白炭黑及黑炭黑8-12份,防老剂1.5-2.5份,交联剂4-6份,非离子表面活性剂3-4份,有机过氧化物1.5-2.5份,膨润土10-15份,硫磺0.3-0.5份,促进剂0.8-1.8份。本发明的吸水膨胀弹性体性能稳定,抗盐吸水树脂与高分子弹性体的相容性好,反复吸水后膨胀率变化小,具有高强度、抗盐性及加工性能好,可满足生产工艺简单、生产成本低廉的要求。(The invention discloses a preparation method of a high-strength salt-resistant water-swelling elastomer, which comprises the following components in parts by weight: comprises the following components which are blended according to the parts by weight: 100-120 parts of elastomer, 20-40 parts of salt-resistant water-absorbing resin, 5-7 parts of barium sulfate and zinc oxide, 1-2 parts of stearic acid, 8-12 parts of spray white carbon black and black carbon, 1.5-2.5 parts of anti-aging agent, 4-6 parts of cross-linking agent, 3-4 parts of nonionic surfactant, 1.5-2.5 parts of organic peroxide, 10-15 parts of bentonite, 0.3-0.5 part of sulfur and 0.8-1.8 parts of accelerator. The water-swelling elastomer has stable performance, good compatibility of the salt-resistant water-absorbing resin and the high-molecular elastomer, small change of swelling rate after repeated water absorption, high strength, good salt resistance and good processability, and can meet the requirements of simple production process and low production cost.)

1. A high-strength salt-resistant water-swellable elastomer is characterized by comprising the following blended components in parts by weight:

(a) 100 to 120 parts of an elastomer,

(b) 20-40 parts of water-absorbing resin,

(c) 3-4 parts of a nonionic surfactant,

(d) 2-3 parts of a rubber cross-linking agent,

(e) 5-7 parts of barium sulfate and zinc oxide,

(f) 1.5 to 2.5 portions of anti-aging agent,

(g) 1-2 parts of stearic acid, namely,

(h) 4-6 parts of liquid butyronitrile,

(i) 3-5 parts of tackifying resin,

(j) 8-12 parts of spray black carbon black and white carbon black,

(k) 1.5 to 2.5 portions of organic peroxide,

(l) 10-15 parts of bentonite, namely 10-15 parts of bentonite,

(m) 0.8-1.5 parts of vulcanizing agent,

(n) 0.8-1.8 parts of accelerator.

2. The high-strength, salt-resistant water-swellable elastomer according to claim 1, characterized in that it comprises: hydrogenated butyronitrile elastomer, natural elastomer, ethylene-propylene elastomer, chloroprene elastomer or a plurality of them;

the water-absorbing resin is salt-resistant polyvinyl alcohol water-absorbing resin;

the nonionic surfactant is one or more of fatty alcohol-polyoxyethylene ether, polyol ester and fatty acid polyglycol ester;

the rubber crosslinking agent is trimethylolpropane tri (3-aziridinyl propionate) or one or two of sulfur, zinc oxide, dicumyl peroxide and magnesium oxide;

the anti-aging agent is 9, 9-dimethylacridine;

the stearic acid is octadecanoic acid;

the liquid butyronitrile is rubber mainly containing butadiene and acrylonitrile in a liquid state;

the tackifying resin is polyurethane resin

The organic peroxide is dicumyl peroxide;

the bentonite is organic bentonite;

the vulcanizing agent is sulfur;

the accelerant is benzoyl peroxide.

3. The high strength, salt resistant water swellable elastomer of claim 2, wherein: the long-chain aliphatic hydrocarbon containing terminal hydroxyl and double bonds of the fatty alcohol polyoxyethylene ether, the polyol ester and the fatty acid polyglycol ester in the nonionic surfactant is aliphatic hydrocarbon of C4-C16.

4. The high-strength salt-resistant water-swellable elastomer according to claim 2, wherein the salt-resistant polyvinyl alcohol-based water-absorbent resin is prepared by the following method:

transferring all materials formed by uniformly mixing an acrylate monomer, acrylic acid and polyhydric alcohol into a reaction device, introducing nitrogen for oxygen removal, then carrying out nitrogen protection, heating to 60-80 ℃, adding an initiator, carrying out reaction for 10-20 hours, adding a cross-linking agent, then heating to 120-140 ℃, heating for 1-4 hours, and carrying out polymerization reaction to obtain the cross-linked resin.

5. The high strength, salt resistant water swellable elastomer of claim 4, wherein:

the using amount of the acrylate monomer is 70-90 parts by weight;

the using amount of the acrylic acid is 1-10 parts by weight;

the using amount of the polyhydric alcohol is 1-10 parts by weight;

the initiator is an oxidation-reduction initiator system formed by an oxidant and a reducing agent, and the using amount is 0.6-1.2 parts by weight;

the cross-linking agent is one or two of acrylamide and vinyl acetate, and the using amount is 1-10 parts by weight.

6. The high strength, salt resistant water swellable elastomer of claim 5, wherein:

the oxidant is one of benzoyl peroxide, ammonium persulfate, potassium persulfate or cumene hydroperoxide, and the using amount is 0.3-0.7 part by weight;

the reducing agent is one or two of N, N-dimethylaniline and tetraethylenepentamine, and the using amount is 0.3-0.5 part by weight.

7. The high strength, salt resistant water swellable elastomer of claim 4, wherein: the polyalcohol is polyethylene glycol with the molecular weight of 600-15000.

8. A method for preparing a high strength, salt resistant water swellable elastomer according to the previous claim, characterized in that: after an elastomer is subjected to thin passing through a packing roll on an internal mixer, sequentially adding water-absorbing resin, a nonionic surfactant, a rubber cross-linking agent, barium sulfate, zinc oxide, an anti-aging agent, stearic acid, liquid butyronitrile, tackifying resin, spray black carbon black, white carbon black, organic peroxide, bentonite, a vulcanizing agent and an accelerator, and uniformly mixing to obtain an elastomer rubber material;

and (3) putting the elastomer rubber material on a flat vulcanizing machine under the pressure of 7-10MPa, the vulcanizing temperature of 100-170 ℃ and the time of 10-40 minutes to obtain the water-swelling elastomer composition.

Technical Field

The invention belongs to the field of engineering application of synthetic polymer elastomer materials and improvement of material strength and salt resistance, and particularly relates to a high-strength salt-resistant water-swelling elastomer material and a preparation method thereof.

Background

The water-absorbing expansion elastomer is a novel functional material, has been introduced since the 70 s in the 20 th century, and can be widely applied to tunnels, subways, culverts, swimming pools, basements, weapon stores, grain warehouses, underwater engineering, oil extraction on sea and land, water supply facilities in cities and towns and civil buildings due to the unique performance, and can also be used for waterproof and moisture-proof packaging of automobile containers, precise instruments, food and the like.

The water absorption mechanism of the water-swellable elastomer is as follows: the elastic matrix is mainly composed of carbon and hydrogen chain links with high polymerization degree, and is a hydrophobic substance. When hydrophilic groups or hydrophilic components are introduced into the matrix and then contacted with water, water molecules enter the matrix to form strong affinity with the hydrophilic groups in the elastomer, and the hydrophilic substances in the elastomer are dissolved or swelled to form osmotic pressure difference inside and outside the elastomer, and the osmotic pressure difference promotes the water to permeate into the elastomer. The hydrophilic substance continuously absorbs water, so that the elastic body is deformed. When the self deformation resistance and the osmotic pressure difference of the elastomer are equal, the balance is achieved, namely the maximum expansion rate of the hydrostatic water is achieved, and the water absorption expansion effect is kept relatively stable.

The existing preparation methods of the water-swelling elastomer mainly comprise two methods: physical blending and chemical grafting.

The preparation of the water-absorbing swelling elastomer by physical blending is water-absorbing swelling glue obtained by physically blending the elastomer and water-absorbing resin. The method has the advantages of simple preparation process, wide raw material source and low cost, but the strong-polarity water-absorbent resin has large cohesion, poor dispersibility and compatibility in the elastomer, and the water-absorbent resin is easy to be desorbed from the elastomer after being soaked in water, so that the expansion rate and the tensile strength are reduced after repeated use.

The chemical grafting method for preparing the water-absorbing swelling elastomer is to graft hydrophilic groups or chain segments onto elastomer macromolecules through chemical reaction to obtain the elastomer with water absorbing capacity. Compared with the hybrid type, the water-swellable elastomer has improved compatibility and strength because hydrophilic groups are chemically bonded to the polymer main chain. However, the chemical grafting method has complex production process, high production cost and great difficulty in realizing industrial production.

In the existing preparation method, the hydrophilic water-absorbent resin (SAP) and the hydrophobic elastomer are physically blended or grafted to form a sea-island shape between the SAP and the elastomer, so that the SAP cannot form a larger affinity, the SAP cannot be well dispersed in an elastomer phase, and the SAP is easy to separate out after being soaked for a long time, namely the SAP runs off from the elastomer, thereby reducing the water absorption performance, the mechanical property, the long-term water retention property and the reusability of the elastomer. Because the elastomer is a hydrophobic material, generally speaking, the elastomer has low polarity and poor hydrophilicity, while the water-absorbent resin has hydrophilic groups and high polarity, and an amphiphilic substance is added into an elastomer/water-absorbent resin blending system to serve as a compatibilizer, so that the compatibility of a hydrophilic dispersed phase and a lipophilic continuous phase is expected to be improved, the falling loss of the water-absorbent resin is reduced, the loss rate of the water-absorbent resin is reduced, and the water-absorbent swelling performance and the mechanical strength of the water-absorbent swelling elastomer are enhanced. Therefore, the problems to be solved urgently for preparing the water-swellable elastomer are as follows: the compatibility of the water-absorbent resin as the hydrophilic component and the elastomer of the hydrophobic component. The use of a suitable compatibilizer (e.g., a hydrophilic-block, lipophilic-block or graft copolymer) can improve the compatibility of the elastomer matrix with the hydrophilic material and reduce the loss of the hydrophilic material by exfoliation.

Some oil field service companies at home and abroad also use the elastomer as a main sealing element of the downhole tool, and the elastomer has great development force, excellent application effect and expanded application field. Particularly in the oil drilling and production engineering, the water-absorbing self-swelling packer is prepared by adopting the water-absorbing swelling elastomer, and the application range and the advantages of the water-absorbing self-swelling packer in the oil drilling and production engineering are mainly embodied in the following points: the method is used for the segmented well completion of the horizontal well, and can automatically seal the first water outlet layer section without the need of later water plugging operation; secondly, when well completion operation is carried out, the cement sheath is put into a complex stratum and above a water layer of a thin interlayer to assist well cementation, oil gas and water channeling can be effectively prevented, and the cement sheath can also be used at two ends of a perforation area to prevent an annular channeling channel from being formed due to damage of operations such as perforation and the like to the cement sheath; and thirdly, for the well condition with high packing operation requirement, a self-expansion packer is adopted, so that long-term effective packing can be realized, the packing life is prolonged, and the packing effect is improved.

The main problems existing at present are that the strength of the expanded elastomer is reduced to meet the requirement of underground sealing, and the sealing effect cannot be realized even if the expansion rate of the elastomer in a stratum with high mineralization is low. The properties of strength and resistance to mineralization of the expanded elastomer need to be addressed.

Disclosure of Invention

The invention aims at the problems existing in the prior art, and provides a high-performance water-swelling elastomer which is simple in production process, stable and good in processability, has strength, salt resistance and swelling rate meeting field use requirements, and simultaneously solves the technical problem of improving the mechanical strength and salt resistance of the water-swelling elastomer, namely a high-strength salt-resistant water-swelling elastomer material and a preparation method thereof.

A high-strength salt-resistant water-swellable elastomer comprises the following blended components in parts by weight:

(a) 100 to 120 parts of an elastomer,

(b) 20-40 parts of water-absorbing resin,

(c) 3-4 parts of a nonionic surfactant,

(d) 2-3 parts of a rubber cross-linking agent,

(e) 5-7 parts of barium sulfate and zinc oxide,

(f) 1.5 to 2.5 portions of anti-aging agent,

(g) 1-2 parts of stearic acid, namely,

(h) 4-6 parts of liquid butyronitrile,

(i) 3-5 parts of tackifying resin,

(j) 8-12 parts of spray black carbon black and white carbon black,

(k) 1.5 to 2.5 portions of organic peroxide,

(l) 10-15 parts of bentonite, namely 10-15 parts of bentonite,

(m) 0.8-1.5 parts of vulcanizing agent,

(n) 0.8-1.8 parts of accelerator. Wherein:

the elastomer includes: hydrogenated butyronitrile elastomer, natural elastomer, ethylene-propylene elastomer, chloroprene elastomer or a plurality of them;

the water-absorbing resin is salt-resistant polyvinyl alcohol water-absorbing resin;

the nonionic surfactant is one or more of fatty alcohol-polyoxyethylene ether, polyol ester and fatty acid polyglycol ester;

the rubber crosslinking agent is trimethylolpropane tri (3-aziridinyl propionate) or one or two of sulfur, zinc oxide, dicumyl peroxide and magnesium oxide;

the anti-aging agent is 9, 9-dimethylacridine;

the stearic acid is octadecanoic acid;

the liquid butyronitrile is rubber mainly containing butadiene and acrylonitrile in a liquid state;

the tackifying resin is polyurethane resin

The organic peroxide is dicumyl peroxide;

the bentonite is organic bentonite;

the vulcanizing agent is sulfur;

the accelerant is benzoyl peroxide.

Further:

the long-chain aliphatic hydrocarbon containing terminal hydroxyl and double bonds of the fatty alcohol polyoxyethylene ether, the polyol ester and the fatty acid polyglycol ester in the nonionic surfactant is aliphatic hydrocarbon of C4-C16.

The salt-resistant polyvinyl alcohol water-absorbent resin is prepared by the following method:

transferring all materials formed by uniformly mixing an acrylate monomer, acrylic acid and polyhydric alcohol into a reaction device, introducing nitrogen for oxygen removal, then carrying out nitrogen protection, heating to 60-80 ℃, adding an initiator, carrying out reaction for 10-20 hours, adding a cross-linking agent, then heating to 120-140 ℃, heating for 1-4 hours, and carrying out polymerization reaction to obtain the cross-linked resin. Wherein:

the using amount of the acrylate monomer is 70-90 parts by weight;

the using amount of the acrylic acid is 1-10 parts by weight;

the using amount of the polyhydric alcohol is 1-10 parts by weight;

the initiator is an oxidation-reduction initiator system formed by an oxidant and a reducing agent, and the using amount is 0.6-1.2 parts by weight;

the cross-linking agent is one or two of acrylamide and vinyl acetate, and the using amount is 1-10 parts by weight.

The oxidant is one of benzoyl peroxide, ammonium persulfate, potassium persulfate or cumene hydroperoxide, and the using amount is 0.3-0.7 part by weight;

the reducing agent is one or two of N, N-dimethylaniline and tetraethylenepentamine, and the using amount is 0.3-0.5 part by weight.

The polyalcohol is polyethylene glycol with the molecular weight of 600-15000.

The invention also provides a preparation method of the water-swelling elastomer with high strength and salt resistance, which comprises the following steps: after an elastomer is subjected to thin passing through a packing roll on an internal mixer, sequentially adding water-absorbing resin, a nonionic surfactant, a rubber cross-linking agent, barium sulfate, zinc oxide, an anti-aging agent, stearic acid, liquid butyronitrile, tackifying resin, spray black carbon black, white carbon black, organic peroxide, bentonite, a vulcanizing agent and an accelerator, and uniformly mixing to obtain an elastomer rubber material;

and (3) putting the elastomer rubber material on a flat vulcanizing machine under the pressure of 7-10MPa, the vulcanizing temperature of 100-170 ℃ and the time of 10-40 minutes to obtain the water-swelling elastomer composition.

In the high-strength salt-resistant water-swelling elastomer component, the elastomer can be various elastomers in the prior art, preferably butyronitrile elastomer, hydrogenated butyronitrile, natural elastomer, ethylene propylene elastomer, chloroprene elastomer or rubber compound thereof, and the raw materials are easy to obtain. The amphiphilic nonionic surfactant has certain water absorption capacity, the water absorption performance of the water-absorbent resin is not influenced, the water absorption performance of the water-absorbent expanded elastomer is enhanced to a certain degree, and the amphiphilic nonionic surfactant serving as a compatibilizer can remarkably improve the mechanical strength of the water-absorbent expanded elastomer containing the super-absorbent resin after water absorption.

The preparation method of the invention directly puts the components including the elastomer, the salt-resistant super absorbent resin and the amphiphilic nonionic surfactant and the auxiliary agent into an open mill or an internal mixer for mixing, and the feeding sequence refers to the mixing procedure of the common elastomer, and the components are subjected to blending plastication and then are vulcanized and pressed for forming, thus obtaining the water-absorbing expansion elastomer. In the preparation process, the equipment for mixing the components is the common mixing equipment, and is selected from the equipment of a mill, an internal mixer and the like in the prior art. The mixing and vulcanization process of the water-swelling elastomer adopts a common method and common mixing equipment in the elastomer industry, and can be an open mill, an internal mixer, a single-screw extruder or a double-screw extruder and the like. The process conditions are also the conditions commonly used in the field of elastomer processing, including temperature, mixing time, etc. In the preparation of the water-swellable elastomer of the invention, more specifically, the blending plastication temperature is 50 ℃ to 90 ℃, and the materials are fully mixed until the materials are uniformly mixed. The kneading is generally carried out for 5 to 60 minutes. And then, the mixture can be placed for 10-12 hours for vulcanization and compression molding.

The water-swellable elastomer of the invention is not affected by the vulcanization system and can be vulcanized in a conventional sulfur vulcanization system or a non-sulfur vulcanization system. The vulcanization of the elastomer is not affected by the vulcanization process, and the elastomer can be injection-molded, plate vulcanized, vulcanizing in a vulcanizing tank, co-molten salt vulcanized, individual vulcanizing machine vulcanized, fluidized bed vulcanized, microwave vulcanized, high-energy ray vulcanized and the like.

The high-strength salt-resistant water-swellable elastomer comprises elastomer processing aids and the dosage of the elastomer processing aids in the prior art, which are common in the prior art and can be adjusted according to actual conditions. In addition, the high-strength salt-resistant water-swellable elastomer of the present invention further comprises other additives commonly used in the elastomer processing field in the prior art, such as fillers, heat stabilizers, antioxidants, light stabilizers, ozone stabilizers, antiblocking agents, foaming agents, dyes, softeners, pigments, waxes, extenders, organic acids, flame retardants, coupling agents, and the like, which are commonly used in elastomer processing vulcanization. The dosage of the used auxiliary agent is conventional dosage or is adjusted according to the requirements of actual conditions.

In summary, the tensile strength of the high-strength and salt-resistant water-swellable elastomer can reach 12MPa, and the water-swelling rate is at least 300%. The preparation method has simple and convenient process, low requirement on equipment and low production cost, and can meet the requirement of engineering materials.

Detailed Description

The present invention will be described in further detail with reference to specific examples.

Comprehensive technical scheme

A high-strength salt-resistant water-swellable elastomer comprises the following blended components in parts by weight:

(a) 100 to 120 parts of an elastomer,

(b) 20-40 parts of water-absorbing resin,

(c) 3-4 parts of a nonionic surfactant,

(d) 2-3 parts of a rubber cross-linking agent,

(e) 5-7 parts of barium sulfate and zinc oxide,

(f) 1.5 to 2.5 portions of anti-aging agent,

(g) 1-2 parts of stearic acid, namely,

(h) 4-6 parts of liquid butyronitrile,

(i) 3-5 parts of tackifying resin,

(j) 8-12 parts of spray black carbon black and white carbon black,

(k) 1.5 to 2.5 portions of organic peroxide,

(l) 10-15 parts of bentonite, namely 10-15 parts of bentonite,

(m) 0.8-1.5 parts of vulcanizing agent,

(n) 0.8-1.8 parts of accelerator. Wherein:

the elastomer includes: hydrogenated butyronitrile elastomer, natural elastomer, ethylene-propylene elastomer, chloroprene elastomer or a plurality of them;

the water-absorbing resin is salt-resistant polyvinyl alcohol water-absorbing resin;

the nonionic surfactant is one or more of fatty alcohol-polyoxyethylene ether, polyol ester and fatty acid polyglycol ester;

the rubber crosslinking agent is trimethylolpropane tri (3-aziridinyl propionate) or one or two of sulfur, zinc oxide, dicumyl peroxide and magnesium oxide;

the anti-aging agent is 9, 9-dimethylacridine;

the stearic acid is octadecanoic acid;

the liquid butyronitrile is rubber mainly containing butadiene and acrylonitrile in a liquid state;

the tackifying resin is polyurethane resin

The organic peroxide is dicumyl peroxide;

the bentonite is organic bentonite;

the vulcanizing agent is sulfur;

the accelerant is benzoyl peroxide.

Further:

the long-chain aliphatic hydrocarbon containing terminal hydroxyl and double bonds of the fatty alcohol polyoxyethylene ether, the polyol ester and the fatty acid polyglycol ester in the nonionic surfactant is aliphatic hydrocarbon of C4-C16.

The salt-resistant polyvinyl alcohol water-absorbent resin is prepared by the following method:

transferring all materials formed by uniformly mixing an acrylate monomer, acrylic acid and polyhydric alcohol into a reaction device, introducing nitrogen for oxygen removal, then carrying out nitrogen protection, heating to 60-80 ℃, adding an initiator, carrying out reaction for 10-20 hours, adding a cross-linking agent, then heating to 120-140 ℃, heating for 1-4 hours, and carrying out polymerization reaction to obtain the cross-linked resin. Wherein:

the using amount of the acrylate monomer is 70-90 parts by weight;

the using amount of the acrylic acid is 1-10 parts by weight;

the using amount of the polyhydric alcohol is 1-10 parts by weight;

the initiator is an oxidation-reduction initiator system formed by an oxidant and a reducing agent, and the using amount is 0.6-1.2 parts by weight;

the cross-linking agent is one or two of acrylamide and vinyl acetate, and the using amount is 1-10 parts by weight.

The oxidant is one of benzoyl peroxide, ammonium persulfate, potassium persulfate or cumene hydroperoxide, and the using amount is 0.3-0.7 part by weight;

the reducing agent is one or two of N, N-dimethylaniline and tetraethylenepentamine, and the using amount is 0.3-0.5 part by weight.

The polyalcohol is polyethylene glycol with the molecular weight of 600-15000.

The preparation method specifically comprises the following process steps:

step one, mixing elastomers

According to the formula provided above, the raw materials and additives are put into an internal mixer together to be mixed into rubber compound.

Step two, vulcanizing the product

And (3) placing the rubber compound prepared in the step one on an open rubber mixing mill for mixing uniformly, placing for 12 hours, then pressing for molding, directly sending into a vulcanizing device for vulcanizing at the vulcanization temperature of 100-170 ℃ for 10-40 minutes, and vulcanizing to obtain the water-absorbing expansion elastomer.

Test standard

The calculation formula of the water absorption expansion ratio is as follows:

test criteria for tensile strength: GB/T528-

Test standards for hardness: GB/T531.1-2008

Example 1

100 parts of Hydrogenated Nitrile Butadiene Rubber (HNBR) are put in an internal mixer and are coated by a thin roll, and then 30 parts of salt-resistant polyvinyl alcohol water-absorbing resin, 3 parts of nonionic surfactant fatty alcohol-polyoxyethylene ether and a cross-linking agent are added in sequence according to the formula3-aziridinylpropan Acid esters2 portions of barium sulfate and 6 portions of zinc oxide, and 9,9 portions of anti-aging agent1.5 parts of dimethylacridine, 1 part of stearic acid octadecanoic acid, 6 parts of liquid nitrile rubber, 3 parts of tackifying resin polyurethane resin, 8 parts of spray black carbon and white carbon black, 1.5 parts of organic peroxide dicumyl peroxide, 10 parts of organic bentonite, 0.8 part of sulfur and 0.8 part of promoter benzoyl peroxide, adding other materials according to a formula, mixing uniformly, finally adding 0.5 part of vulcanizing agent sulfur, mixing uniformly, passing through the mixture, packaging in a triangular mode for 6 times, and discharging. And vulcanizing the elastomer rubber material on a flat vulcanizing machine at the pressure of 9MPa and the temperature of 170 ℃ for 10 minutes to obtain the water-swelling elastomer composition.

Example 2

80 parts of Hydrogenated Nitrile Butadiene Rubber (HNBR)/Nitrile Butadiene Rubber (NBR) are put in an internal mixer to be thinly rolled, and then 33 parts of polyvinyl alcohol water-absorbing resin and nonionic surfactant polyol ester are added according to the formula in turnPolyoxyethylene ethers3 parts of cross-linking agent3-aza Propiophenone propionate2 parts of barium sulfate and zinc oxide, 6 parts of an anti-aging agent 9, 9-dimethylacridine, 1 part of stearic acid octadecanoic acid, 6 parts of liquid nitrile rubber, 3 parts of tackifying resin polyurethane resin, 8 parts of spray black carbon and white carbon black, 1.5 parts of dicumyl peroxide, 10 parts of organic bentonite, 0.8 part of sulfur and 0.8 part of promoter benzoyl peroxide, adding other materials according to the formula, uniformly mixing, finally adding 0.5 part of vulcanizing agent sulfur, uniformly mixing, thinly passing, packaging for 6 times by a triangular bag, and discharging. And vulcanizing the elastomer rubber material on a flat vulcanizing machine at the pressure of 8MPa and the temperature of 170 ℃ for 10 minutes to obtain the water-swelling elastomer composition.

Example 3

50 parts of Hydrogenated Nitrile Butadiene Rubber (HNBR)/50 parts of Nitrile Butadiene Rubber (NBR) are put on a thin roll in an internal mixer, and then 34 parts of polyvinyl alcohol water-absorbing resin and nonionic surfactant are added in turn according to the formulaFatty acid polyethylene glycolEster 3 parts, cross-linking agent3- Aziridinyl propionates2 parts of barium sulfate and zinc oxide, 6 parts of an anti-aging agent 9, 9-dimethylacridine, 1 part of stearic acid octadecanoic acid, 6 parts of liquid nitrile rubber, 3 parts of tackifying resin polyurethane resin, 8 parts of spray black carbon black and white carbon black, 1.5 parts of organic peroxide dicumyl peroxide, 10 parts of organic bentonite, 0.8 part of vulcanizing agent sulfur and 0 part of accelerator benzoyl peroxide.Adding other materials into 8 parts of the formula, uniformly mixing, finally adding 0.5 part of vulcanizing agent sulfur, uniformly mixing, thinly passing, packaging in a triangular bag for 6 times, and then slicing. And vulcanizing the elastomer rubber material on a flat vulcanizing machine at the pressure of 8MPa and the temperature of 170 ℃ for 10 minutes to obtain the water-swelling elastomer composition.

Example 4

75 parts of hydrogenated nitrile butadiene rubber HNBR/25 parts of Ethylene Propylene Diene Monomer (EPDM) are put in an internal mixer and are passed through a wrapping roller, 34 parts of polyvinyl alcohol water-absorbing resin, 3 parts of nonionic surfactant polyol ester, 2 parts of cross-linking agent 3-aziridinyl propionate, 6 parts of barium sulfate and zinc oxide, 1.5 parts of anti-aging agent 9, 9-dimethylacridine, 1 part of stearic acid octadecanoic acid, 6 parts of liquid nitrile rubber, 3 parts of tackifying resin polyurethane resin, 8 parts of spray black carbon black and white carbon black, 1.5 parts of organic peroxide dicumyl peroxide, 10 parts of organic bentonite, 0.8 part of vulcanizing agent sulfur and 0.8 part of accelerator benzoyl peroxide are added in the formula, and are mixed uniformly, finally 0.5 part of vulcanizing agent is added, and the mixture is passed through after being mixed uniformly, and is packed in triangular bags for 6 times and then the sulfur is put down. And vulcanizing the elastomer rubber material on a flat vulcanizing machine at the pressure of 10MPa and the temperature of 170 ℃ for 10 minutes to obtain the water-swelling elastomer composition.

Example 5

50 parts of hydrogenated nitrile butadiene rubber HNBR/50 parts of Ethylene Propylene Diene Monomer (EPDM) are sequentially added with 36 parts of polyvinyl alcohol water-absorbing resin, 3 parts of nonionic surfactant polyol ester, 2 parts of crosslinking agent 3-aziridinyl propionate, 6 parts of barium sulfate and zinc oxide, 1.5 parts of anti-aging agent 9, 9-dimethylacridine, 1-part of stearic acid octadecanoic acid, 6 parts of liquid nitrile rubber, 3 parts of tackifying resin polyurethane resin, 8 parts of spray black carbon black and white carbon black, 1.5 parts of organic peroxide dicumyl peroxide, 10 parts of organic bentonite, 0.8 part of vulcanizing agent sulfur and 0.8 part of accelerator benzoyl peroxide by formula, and are uniformly mixed, finally 0.5 part of vulcanizing agent is added, and the mixture is subjected to thin-pass, triangular bag packing for 6 times and then is sliced. And vulcanizing the elastomer rubber material on a flat vulcanizing machine at the pressure of 10MPa and the temperature of 170 ℃ for 10 minutes to obtain the water-swelling elastomer composition.

Example 6

60 parts of hydrogenated nitrile butadiene rubber HNBR/40 parts of polyurethane rubber (UR) are sequentially added with 36 parts of polyvinyl alcohol water-absorbing resin, 3 parts of nonionic surfactant polyol ester, 2 parts of crosslinking agent 3-aziridinyl propionate, 6 parts of barium sulfate and zinc oxide, 1.5 parts of anti-aging agent 9, 9-dimethylacridine, 1 part of stearic acid octadecanoic acid, 6 parts of liquid nitrile rubber, 3 parts of tackifying resin polyurethane resin, 8 parts of spray black carbon black and white carbon black, 1.5 parts of organic peroxide dicumyl peroxide, 10 parts of organic bentonite, 0.8 part of vulcanizing agent sulfur and 0.8 part of accelerator benzoyl peroxide by formula, and are uniformly mixed, finally, 0.5 part of vulcanizing agent is added, and the mixture is subjected to thin-pass, triangular packaging for 6 times and then sheet feeding. And vulcanizing the elastomer rubber material on a flat vulcanizing machine at the pressure of 9MPa and the temperature of 165 ℃ for 10 minutes to obtain the water-swelling elastomer composition.

Example 7

50 parts of hydrogenated nitrile butadiene rubber HNBR/50 parts of polyurethane rubber (UR) are sequentially added with 38 parts of polyvinyl alcohol water-absorbing resin, 3 parts of nonionic surfactant polyol ester, 2 parts of crosslinking agent 3-aziridinyl propionate, 6 parts of barium sulfate and zinc oxide, 1.5 parts of anti-aging agent 9, 9-dimethylacridine, 1-part of stearic acid octadecanoic acid, 6 parts of liquid nitrile rubber, 3 parts of tackifying resin polyurethane resin, 8 parts of spray black carbon and white carbon black, 1.5 parts of organic peroxide dicumyl peroxide, 10 parts of organic bentonite, 0.8 part of vulcanizing agent sulfur and 0.8 part of accelerator benzoyl peroxide by formula, and are uniformly mixed, finally 0.5 part of vulcanizing agent is added, and the mixture is uniformly mixed, then is subjected to thin pass, and is subjected to triangular bag making for 6 times and then is subjected to piece feeding. And vulcanizing the elastomer rubber material on a flat vulcanizing machine at the pressure of 9MPa and the temperature of 165 ℃ for 10 minutes to obtain the water-swelling elastomer composition.

The test results for the samples prepared in the above examples are as follows:

table 1 performance of the products of the examples

As is clear from the data in Table 1, the high-strength, salt-resistant water-swellable elastomer of the present invention has high strength and excellent mechanical properties. The water-swellable elastomer material of the present invention has an expansion rate of 370% at a degree of mineralization of 20% by mass, 330% at a degree of mineralization of 12% by mass, and 290% at a degree of mineralization of 12% by mass, and is excellent in ion resistance and suitable for use in a relatively complex environment (e.g., a complex oil field downhole environment).