CN103665265A - Preparation method of acrylonitrile-butadiene rubber - Google Patents
Preparation method of acrylonitrile-butadiene rubber Download PDFInfo
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- CN103665265A CN103665265A CN201210349979.4A CN201210349979A CN103665265A CN 103665265 A CN103665265 A CN 103665265A CN 201210349979 A CN201210349979 A CN 201210349979A CN 103665265 A CN103665265 A CN 103665265A
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- paracril
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Abstract
The invention relates to a preparation method of an acrylonitrile-butadiene rubber, belonging to a manufacturing method of a high-molecular compound by copolymerizing butadiene and acrylonitrile. The acrylonitrile-butadiene rubber is prepared by carrying out cold-process intermitted emulsion polymerization on the raw materials butadiene and acrylonitrile. The method is characterized in that the acrylonitrile-butadiene rubber has the following technical indexes: the Mooney viscosity is 30-95, the acrylonitrile monomer content accounts for 18-46 wt%, the degree of swelling is 20-50%, and the tensile strength is 10-22 Mpa. The invention provides an acrylonitrile-butadiene rubber with different acrylonitrile contents and excellent oil resistance and physical and mechanical properties and a preparation method thereof. The reaction temperature and the butadiene-acrylonitrile monomer ratio are regulated and controlled by using the unique emulsion system, redox system, monomer feeding mode and technological conditions; and the acrylonitrile and butadiene are subjected to emulsion copolymerization to obtain the acrylonitrile-butadiene rubbers with different acrylonitrile contents. The acrylonitrile-butadiene rubber prepared by the method has favorable oil resistance; and the method is suitable for preparing acrylonitrile-butadiene rubber raw materials required by various oil-resistant rubber products.
Description
Technical field
The present invention is a kind of preparation method of paracril.Belong to divinyl and react the manufacture method of the macromolecular compound obtaining with acrylonitrile compolymer.
Background technology
Paracril (NBR) is obtained through emulsion polymerization by divinyl and two kinds of monomers of vinyl cyanide, owing to containing unsaturated double-bond and polar group-CN in its molecular chain, make it to have oil resistance good, the features such as physical and mechanical properties excellence, various oil-resistant articles have been widely used in, as O type ring, snake (soft) leather hose, packing ring, fuel container line with rubber, tank linning, printing running stores, printing cylinder, insulation ground backing plate, vulcanite part, at the bottom of oil-resistant shoe, fabric coating, the impeller of pump, oil well brushing, gas thread protective layer, trunking, tackiness agent, the aspect such as rubber gloves and food packing film, exploitation prospect is wide.
At present, industrial production paracril adopts continuously or intermittent type emulsion polymerization technique, different by polymerization temperature, is divided into hot method polymerization and cold process polymerization two classes.The temperature of reaction general control of cold process polymerization is at 5～15 ℃, and hot method polymerization is 30～50 ℃.Most paracril product adopts the poly-technology of continuous cold to produce.
Preparation method's weak point of paracril of the prior art be oil-proofness and physical and mechanical properties not good enough.The adjustable paracril of acrylonitrile content there is not yet report.
Summary of the invention
The object of the invention is to avoid above-mentioned the deficiencies in the prior art part, and a kind of paracril with different acrylonitrile content oil-proofnesss and physical and mechanical properties excellence and preparation method thereof is provided.
Object of the present invention can reach by following measure:
The preparation method of paracril of the present invention, is made through cold process discontinuous emulsion polymerization by raw material divinyl and vinyl cyanide, it is characterized in that prepared butyronitrile rubber reaches following technical indicator:
Adopt as follows according to the proportioning raw materials of mass fraction meter:
Its preparation method comprises the steps:
In polymeric kettle, order adds the partial monosomy vinyl cyanide in water, emulsifying agent, assistant for emulsifying agent, emulsion stabilizer and formula, passes into nitrogen pressure testing, confirms that polymeric kettle, without after leaking, with nitrogen replacement for several times, then adds comonomer divinyl, starting polymeric kettle stirs, and pass into cold water cooling in polymeric kettle interlayer and temperature-reducing coil, when polymerization temperature in the kettle is down to 5～10 ℃, order adds the oxygenant of redox initiator, reductive agent, secondary reduction agent and sequestrant, add again molecular weight regulator, polymeric reaction temperature is controlled at 5～30 ℃, according to the acrylonitrile content requirement of the paracril product of different size, add all the other acrylonitrile monemers in formula, polymerization reaction time was controlled between 7～12 hours, monomer conversion is controlled between 65%～80%, add terminator, terminating emulsion polymerized reaction, obtained paracril latex, through degassed, cohesion, hot air dries, obtains paracril product of the present invention, by regulating the add-on of different vinyl cyanide, divinylic monomer, the adjusting of proportioning raw materials and processing condition, obtains the paracril of different acrylonitrile contents, makes it to have good oil-proofness and excellent physical and mechanical properties.
The present invention adopts the aspects such as emulsification system unlike the prior art, redox system, route of adding monomer, processing condition, by the emulsion copolymerization of vinyl cyanide, divinyl, obtain the paracril of different acrylonitrile contents, make it to have good oil-proofness and excellent physical and mechanical properties.
The present inventor is by the screening to feed composition and proportioning, the optimization of polymerization process condition and the organic compatibility of the two.Made the paracril rubber with different acrylonitrile content oil-proofnesss and physical and mechanical properties excellence of the present invention.Thereby completed task of the present invention.
Object of the present invention can also reach by following measure:
The preparation method of paracril of the present invention, emulsifying agent described in feed composition is selected from RA rosin acid or/and soap.
The preparation method of paracril of the present invention, assistant for emulsifying agent described in feed composition is the sodium salt (sodiumβ-naphthalenesulfonate formaldehyde condensation products) of naphthene sulfonic acid and formaldehyde condensation products.
The preparation method of paracril of the present invention, oxygenant described in feed composition in redox initiator is di-isopropylbenzene hydroperoxide, reductive agent in described redox initiator is iron edta sodium salt or secondary reduction agent rongalite, and in redox initiator, secondary reduction agent is rongalite.
The preparation method of paracril of the present invention, emulsion stabilizer described in feed composition is K
3pO
4or KCl.
The preparation method of paracril of the present invention, sequestrant described in feed composition is tetrasodium salt of EDTA or potassium pyrophosphate with sequestrant.
The preparation method of paracril of the present invention, molecular weight regulator described in feed composition is selected from any one in tert-dodecyl mercaptan, uncle's ten carbon mercaptan, uncle's 14 carbon mercaptan, uncle's 16 carbon mercaptan.
The preparation method of paracril of the present invention, molecular weight regulator described in feed composition is tert-dodecyl mercaptan.
The preparation method of paracril of the present invention, the polymeric reaction temperature in described preparation process is controlled between 5～15 ℃.
The preparation method of paracril of the present invention, in described preparation process, the feed way of raw material divinyl adopts gradation to add.
The preparation method of paracril of the present invention, in described preparation process, raw material divinyl is divided into 2～3 times and adds.It is preferred technical scheme.
The preparation method of paracril of the present invention, is made through cold process discontinuous emulsion polymerization by raw material divinyl and vinyl cyanide, it is characterized in that prepared butyronitrile rubber reaches following technical indicator:
Adopt as follows according to the proportioning raw materials of mass fraction meter:
It is a preferred technical scheme.
The preparation method of paracril of the present invention, is made through cold process discontinuous emulsion polymerization by raw material divinyl and vinyl cyanide, it is characterized in that prepared butyronitrile rubber reaches following technical indicator:
Adopt as follows according to the proportioning raw materials of mass fraction meter:
In described preparation process, raw material divinyl is divided into 2 times and adds.
It is a preferred technical scheme.
The preparation method of paracril of the present invention, is made through cold process discontinuous emulsion polymerization by raw material divinyl and vinyl cyanide, it is characterized in that prepared butyronitrile rubber reaches following technical indicator:
Adopt as follows according to the proportioning raw materials of mass fraction meter:
In described preparation process, raw material divinyl is divided into 3 times and adds.
The preparation method of paracril of the present invention, is made through cold process discontinuous emulsion polymerization by raw material divinyl and vinyl cyanide, it is characterized in that prepared butyronitrile rubber reaches following technical indicator:
Adopt as follows according to the proportioning raw materials of mass fraction meter:
In described preparation process, raw material divinyl is divided into 2 times and adds.
It is preferred technical scheme.
The preparation method's of paracril of the present invention application, is characterized in that being applicable to prepare the needed paracril raw material of various oil resisting rubber goods.
The preparation method of paracril of the present invention, has following positively effect compared to existing technology:
1. a kind of paracril rubber with different acrylonitrile content oil-proofnesss and physical and mechanical properties excellence and preparation method thereof is provided.
2. adopt the aspects such as emulsification system unlike the prior art, redox system, route of adding monomer, processing condition, by the emulsion copolymerization of vinyl cyanide, divinyl, obtain the paracril of different acrylonitrile contents, make it to have good oil-proofness and excellent physical and mechanical properties.
3. by regulating and controlling temperature of reaction and divinyl, acrylonitrile monemer proportioning, preparation one class has the rubber of different acrylonitrile contents.
4. the prepared butadiene-acrylonitrile copolymer of the present invention has following feature: the mooney viscosity of multipolymer is 30～90, and bound acrylonitrile content general range is 18%～46% (mass ratio, in monomer total amount 100%).
5. the paracril mooney viscosity that adopts method of the present invention to prepare is 30～90, and better scope is 40～80, and optimum range is 50～70; .Bound acrylonitrile content scope is 18%～46%.
6. the paracril that adopts method of the present invention to prepare, has good oil resistance, is applicable to prepare the needed paracril raw material of various oil resisting rubber goods.
Embodiment
The present invention will now be further detailed embodiment:
Embodiment 1
The preparation method of paracril of the present invention, is made through cold process discontinuous emulsion polymerization by raw material divinyl and vinyl cyanide, it is characterized in that prepared butyronitrile rubber reaches following technical indicator:
Adopt as follows according to the proportioning raw materials of mass fraction meter:
Its preparation method comprises the steps:
In polymeric kettle, order adds the partial monosomy vinyl cyanide in water, emulsifying agent, assistant for emulsifying agent, emulsion stabilizer and formula, passes into nitrogen pressure testing, confirms that polymeric kettle, without after leaking, with nitrogen replacement for several times, then adds comonomer divinyl; Starting polymeric kettle stirs, and pass into cold water cooling in polymeric kettle interlayer and temperature-reducing coil, when polymerization temperature in the kettle is down to 5～10 ℃, order adds oxygenant, reductive agent, secondary reduction agent and the sequestrant of redox initiator, add again molecular weight regulator, polymeric reaction temperature is controlled at 5～30 ℃, when reaction proceeds to 3～8 hours, add all the other acrylonitrile monemers in formula, polymerization reaction time was controlled between 7～12 hours, monomer conversion is controlled between 65%～80%, adds terminator, terminating emulsion polymerized reaction; Obtained paracril latex, through degassed, cohesion, hot air dries, obtains paracril product of the present invention.
Embodiment 2～embodiment 8
According to the method for embodiment 1 and step, formula is listed in table 1 with performance
Table 1
Claims (16)
1. a preparation method for paracril, is made through cold process discontinuous emulsion polymerization by raw material divinyl and vinyl cyanide, it is characterized in that prepared butyronitrile rubber reaches following technical indicator:
Adopt as follows according to the proportioning raw materials of mass fraction meter:
Its preparation method comprises the steps:
In polymeric kettle, order adds the partial monosomy vinyl cyanide in water, emulsifying agent, assistant for emulsifying agent, emulsion stabilizer and formula, passes into nitrogen pressure testing, confirms that polymeric kettle, without after leaking, with nitrogen replacement for several times, then adds comonomer divinyl, starting polymeric kettle stirs, and pass into cold water cooling in polymeric kettle interlayer and temperature-reducing coil, when polymerization temperature in the kettle is down to 5～10 ℃, order adds the oxygenant of redox initiator, reductive agent, secondary reduction agent and sequestrant, add again molecular weight regulator, polymeric reaction temperature is controlled at 5～30 ℃, according to the acrylonitrile content requirement of the paracril product of different size, add all the other acrylonitrile monemers in formula, polymerization reaction time was controlled between 7～12 hours, monomer conversion is controlled between 65%～80%, add terminator, terminating emulsion polymerized reaction, obtained paracril latex, through degassed, cohesion, hot air dries, obtains paracril product of the present invention, by regulating the add-on of different vinyl cyanide, divinylic monomer, the adjusting of proportioning raw materials and processing condition, obtains the paracril of different acrylonitrile contents, makes it to have good oil-proofness and excellent physical and mechanical properties.
2. according to the preparation method of the paracril of claim 1, it is characterized in that emulsifying agent described in feed composition is selected from RA rosin acid or/and soap.
3. according to the preparation method of the paracril of claim 1, it is characterized in that assistant for emulsifying agent described in feed composition is the sodium salt (sodiumβ-naphthalenesulfonate formaldehyde condensation products) of naphthene sulfonic acid and formaldehyde condensation products.
4. according to the preparation method of the paracril of claim 1, it is characterized in that described in feed composition, the oxygenant in redox initiator is di-isopropylbenzene hydroperoxide, reductive agent in described redox initiator is iron edta sodium salt or secondary reduction agent rongalite, and in redox initiator, secondary reduction agent is rongalite.
5. according to the preparation method of the paracril of claim 1, it is characterized in that emulsion stabilizer described in feed composition is K
3pO
4or KCl.
6. according to the preparation method of the paracril of claim 1, it is characterized in that sequestrant described in feed composition is tetrasodium salt of EDTA or potassium pyrophosphate with sequestrant.
7. according to the preparation method of the paracril of claim 1, it is characterized in that molecular weight regulator described in feed composition is selected from any one in tert-dodecyl mercaptan, uncle's ten carbon mercaptan, uncle's 14 carbon mercaptan, uncle's 16 carbon mercaptan.
8. according to the preparation method of the paracril of claim 1, it is characterized in that molecular weight regulator described in feed composition is tert-dodecyl mercaptan.
9. according to the preparation method of the paracril of claim 1, it is characterized in that the polymeric reaction temperature in described preparation process is controlled between 5～15 ℃.
10. according to the preparation method of the paracril of claim 1, it is characterized in that in described preparation process, the feed way of raw material divinyl adopts gradation to add.
11. according to the preparation method of the paracril of claim 10, it is characterized in that in described preparation process, and raw material divinyl is divided into 2～3 times and adds.
12. according to the preparation method of the paracril of claim 1, by raw material divinyl and vinyl cyanide, through cold process discontinuous emulsion polymerization, is made, and it is characterized in that prepared butyronitrile rubber reaches following technical indicator:
Adopt as follows according to the proportioning raw materials of mass fraction meter:
13. according to the preparation method of the paracril of claim 1, by raw material divinyl and vinyl cyanide, through cold process discontinuous emulsion polymerization, is made, and it is characterized in that prepared butyronitrile rubber reaches following technical indicator:
Adopt as follows according to the proportioning raw materials of mass fraction meter:
In described preparation process, raw material divinyl is divided into 2 times and adds.
14. according to the preparation method of the paracril of claim 1, by raw material divinyl and vinyl cyanide, through cold process discontinuous emulsion polymerization, is made, and it is characterized in that prepared butyronitrile rubber reaches following technical indicator:
Adopt as follows according to the proportioning raw materials of mass fraction meter:
In described preparation process, raw material divinyl is divided into 3 times and adds.
15. according to the preparation method of the paracril of claim 1, by raw material divinyl and vinyl cyanide, through cold process discontinuous emulsion polymerization, is made, and it is characterized in that prepared butyronitrile rubber reaches following technical indicator:
Adopt as follows according to the proportioning raw materials of mass fraction meter:
In described preparation process, raw material divinyl is divided into 2 times and adds.
The preparation method's of the paracril of 16. claims 1 application, is characterized in that being applicable to prepare the needed paracril raw material of various oil resisting rubber goods.
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| CN201210349979.4A CN103665265B (en) | 2012-09-20 | 2012-09-20 | A kind of preparation method of nitrile rubber |
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| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN116003711A (en) * | 2021-10-21 | 2023-04-25 | 中国石油化工股份有限公司 | Nitrile rubber and preparation method thereof, hydrogenated nitrile rubber, nitrile rubber composition and nitrile rubber vulcanized rubber |
Citations (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN101649026A (en) * | 2009-06-06 | 2010-02-17 | 中国石油兰州石油化工公司 | Preparation method of butyronitrile latex with high nitrile group content |
| CN102653579A (en) * | 2011-03-03 | 2012-09-05 | 中国石油天然气股份有限公司 | Nitrile rubber and preparation method thereof |
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| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN101649026A (en) * | 2009-06-06 | 2010-02-17 | 中国石油兰州石油化工公司 | Preparation method of butyronitrile latex with high nitrile group content |
| CN102653579A (en) * | 2011-03-03 | 2012-09-05 | 中国石油天然气股份有限公司 | Nitrile rubber and preparation method thereof |
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN116003711A (en) * | 2021-10-21 | 2023-04-25 | 中国石油化工股份有限公司 | Nitrile rubber and preparation method thereof, hydrogenated nitrile rubber, nitrile rubber composition and nitrile rubber vulcanized rubber |
| CN116003711B (en) * | 2021-10-21 | 2023-06-20 | 中国石油化工股份有限公司 | Nitrile rubber and preparation method thereof, hydrogenated nitrile rubber, nitrile rubber composition and nitrile rubber vulcanized rubber |
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