Skyhigh nitrile crosslinking type powdery butadiene-acrylonitrile rubber and preparation method thereof
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A powdered nitrile rubber, cross-linked technology, applied in the field of powdered nitrile rubber, can solve the problem of inability to produce low nitrile and extremely high nitrile content powdered nitrile rubber, etc., to reduce the difficulty and cost of sewage treatment, acrylonitrile The effect of reducing the content and improving the heat resistance
Active Publication Date: 2019-02-12
安庆华兰科技有限公司
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Problems solved by technology
According to the above-mentioned patent method, two different types of powdered nitrile rubbers of medium nitrile and medium-high nitrile can be produced, but through the above formula and process conditions, simply adjusting the addition ratio of butadiene and acrylonitrile cannot produce low nitrile and powdered nitrile rubber with very high nitrile content
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Embodiment 1
[0023] (1) Synthetic nitrile latex: First, the polymerization kettle is evacuated, and 180 parts of deionized water, 2.5 parts of emulsifier sodium dodecylbenzenesulfonate, 0.5 part of electrolyte potassium carbonate, molecular weight regulator tertiary ten 0.5 part of dialkyl mercaptan, 45 parts of acrylonitrile, initiator (the compound of ammonium persulfate and diacid block, ferrous sulfate, EDTA tetrasodium, EDTA iron sodium is 1:0.5:0.25:0.1:0.1 by weight substance) 0.3 parts, nitrogen filling and vacuuming repeated twice, add 25 parts of butadiene, start stirring, start to heat up to 15-25 ° C, when the polymerization conversion rate reaches 40-45%, start the first addition of butadiene 15 parts of diene, adding time of 0.5 hours; when the conversion rate of polymerization reaction reaches 60-65%, start to add 15 parts of butadiene for the second time, adding time of 0.5 hours; when the conversion rate of polymerization reaction reaches 80% , add 0.2 parts of initiator (...
Embodiment 2
[0027] In the step of synthesizing nitrile latex of embodiment 1, add 200 parts of deionized water, 50 parts of acrylonitrile, 20 parts of butadiene, 3.0 parts of emulsifier sodium lauryl sulfate, other technological formulas are the same as embodiment 1.
[0028] After coagulation into powder, centrifugal dehydration and drying, powdery nitrile rubber is obtained with a water content of 0.7%.
[0029] Sampling analysis shows that the index of the obtained powdered nitrile rubber is: the combined nitrile content is 45.2%, and the gel content is 88%.
Embodiment 3
[0031] In the step of synthesizing nitrile latex in embodiment 1, add 40 parts of acrylonitrile, 30 parts of butadiene, 3.0 parts of emulsifier potassium oleate, other technological formulas are the same as embodiment 1.
[0032] After coagulation into powder, centrifugal dehydration and drying, powdered nitrile rubber is obtained with a water content of 0.6%.
[0033]Sampling analysis shows that the index of the obtained powdered nitrile rubber is: the combined nitrile content is 43.6%, and the gel content is 89%.
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Abstract
The invention discloses a preparation method of skyhigh nitrile crosslinking type powdery butadiene-acrylonitrile rubber. The preparation method comprises the following steps that firstly butadiene and acrylonitrile serve as monomers to synthesize butadiene-acrylonitrile latex through emulsion polymerization; then the butadiene-acrylonitrile latex is agglomerated into powder and subjected to centrifugal dehydration and drying, and the skyhigh nitrile crosslinking type powdery butadiene-acrylonitrile rubber is obtained. At the synthesis stage of the butadiene-acrylonitrile latex, the butadiene-acrylonitrile latex is prepared from 40-50 parts of acrylonitrile and 20-30 parts of butadiene; one of ammonium persulfate, potassium persulfate or diisopropylbenzene hydroperoxide is added into sodium formaldehyde sulfoxylate, ferrous sulfate, EDTA (ethylenediaminetetraacetic acid) tetrasodium and EDTA ferrisodium at the weight ratio of 1 to 0.5 to 0.25 to 0.1 to 0.1 to form a compound which serves as an initiator. The invention further discloses skyhigh nitrile crosslinking type powdery butadiene-acrylonitrile rubber prepared by adopting the method. The preparation method has the advantagesthat the polymerization reaction technology with high and mediate temperature combining is adopted; polymerization conversion rate is high, and no acrylonitrile and butadiene recycling devices are needed; the monomers react completely, and the cost is low; product quality stability is effectively improved, and oil resistance is better; the crosslinking of molecular chains is effectively completed,and the abrasion resistance and the heat resistance of the product are better.
Description
technical field [0001] The invention relates to the technical field of powdered nitrile rubber, in particular to a cross-linked powdered nitrile rubber with extremely high nitrile content 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 a...
Claims
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Application Information
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