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A kind of low nitrile non-crosslinking type powder nitrile rubber and preparation method thereof
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A powdered nitrile rubber, non-cross-linked technology, applied in the field of powdered nitrile rubber, can solve the problems of difficult to form powder particles, high safety risk, high viscosity, etc., and achieve the effect of easy operation, simple production process and good product performance
Active Publication Date: 2021-01-12
安庆华兰科技有限公司
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Problems solved by technology
The low-nitrile non-crosslinked powdered nitrile rubber has not yet been produced, mainly because the polymerization reaction is usually carried out under low temperature conditions, the conversion rate is generally 70%, and there are still a large amount of monomers to be recovered, which requires large investment and high safety risks. In addition, low nitrile content latex is difficult to form powder particles due to its good toughness and high viscosity.
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Embodiment 1
[0021] (1) Synthetic nitrile latex: First, the polymerization kettle is evacuated, and 180 parts of deionized water, 2.0 parts of emulsifier disproportionated potassium abietate, 0.4 part of electrolyte potassium carbonate, molecular weight regulator tert-dodecylsulfur 0.5 parts of alcohol, 5 parts of acrylonitrile, 0.2 parts of initiator (composite of ammonium persulfate and white block, ferrous sulfate, and disodium EDTA in a weight ratio of 1:0.5:0.25:0.1), and vacuumize repeatedly with nitrogen gas Twice, add 85 parts of butadiene, start stirring, start to heat up to 10-15°C, and react for 3-4 hours. When the conversion rate of the polymerization reaction reaches 30-35%, start to continuously add 10 parts of acrylonitrile, Initiator (composite of ammonium persulfate and white block, ferrous sulfate, and disodium EDTA in a weight ratio of 1:0.5:0.25:0.1) 0.2 parts, emulsifier disproportionated potassium abietate 1.0 parts, supplementary duration 3 hours, continue to react f...
Embodiment 2
[0025] In the synthesis step of nitrile latex in embodiment 1, add 190 parts of deionized water, 8 parts of acrylonitrile, 82 parts of butadiene, 3.0 parts of emulsifier sodium dodecylbenzene sulfonate, other process formulas are the same as implementing example 1.
[0026] After coagulation into powder, centrifugal dehydration and drying, powdery nitrile rubber is obtained with a water content of 0.7%.
[0027] Sampling analysis shows that the indexes of the obtained powdered nitrile rubber are: combined nitrile content of 17.2%, Mooney 45, and gel content of 0.6%.
Embodiment 3
[0029] In the synthesis step of nitrile latex in embodiment 1, 10 parts of acrylonitrile, 80 parts of butadiene, 3.0 parts of emulsifier sodium lauryl sulfate, other process formulas are the same as embodiment 1.
[0030] After coagulation into powder, centrifugal dehydration and drying, powdered nitrile rubber is obtained with a water content of 0.6%.
[0031] Sampling analysis shows that the index of the obtained powdered nitrile rubber is: combined nitrile content of 18.5%, Mooney 47, and gel content of 0.5%.
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Abstract
The invention discloses a preparation method of low-nitrile non-crosslinked powdered butadiene-acrylonitrile rubber. The preparation method comprises the following steps of firstly, by taking butadiene and acrylonitrile as monomers, performing emulsion polymerization to synthesize butadiene-acrylonitrile latex, then performing condensation on the butadiene-acrylonitrile latex to prepare powder, and performing centrifugal dewatering and drying to obtain the low-nitrile non-crosslinked powdered butadiene-acrylonitrile rubber. In the stage of synthesizing the butadiene-acrylonitrile latex, the butadiene-acrylonitrile latex is prepared from the following components in parts by weight: 5-10 parts of acrylonitrile and 80-85 parts of butadiene by taking a compound, prepared from any one of ammonium persulfate, potassium peroxodisulfate and diisopropylbenzene hydroperoxide, sodium formaldehydesulfoxylate dihydrate, ferrous sulfate and EDTA disodium with the weight ratio of 1 to 0.5 to 0.25 to0.1 as an initiator. The preparation method has the advantages that the production technology is simple and liable to operate; polymerization conversion rate is improved, so that investment cost of the butadiene and acrylonitrile monomer recovery device is reduced; distribution of the acrylonitrile structural unit is more uniform; increase of polymerization reaction conversion rate at a lower temperature is facilitated; and the problem that the non-crosslinked butadiene-acrylonitrile latex with low nitrile content is difficult to prepare into powder is solved.
Description
technical field [0001] The invention relates to the technical field of powdered nitrile rubber, in particular to a low-nitrile non-crosslinked powdered nitrile rubber and a preparation method thereof. Background technique [0002] Powdered nitrile rubber is a polymer rubber emulsion synthesized by emulsion polymerization of butadiene, acrylonitrile and additives, and then powdered rubber is obtained through coagulation, powdering and drying. [0003] Powdered nitrile rubber has the advantages of small particle size, good dispersion when blended with other resins, and can be directly processed by plastic molding technology, which is conducive to the realization of continuous and automatic processing. At present, powdered nitrile rubber can be divided into non-cross-linked type (gel content<1%), micro-cross-linked type (gel content 5-30%) and cross-linked type (gel content 75-95%) according to the type of cross-linking. %) three types, and their uses are also different, am...
Claims
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Application Information
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