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Coagulant for NBR latex coagulation and NBR latex coagulation method

A coagulant and latex technology, which is applied in the field of coagulant and NBR latex coagulation, can solve the problems that affect the product's oil resistance, mechanical performance decline, and slow layering and precipitation, and achieve the effect of low price, low cost and convenient preparation

Pending Publication Date: 2022-05-20
CHINA PETROLEUM & CHEM CORP +1
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0009] In view of the fact that the existing NBR latex contains oleic acid soap and rosin soap, the content of organic acid and soap in the dry rubber reaches 3-5% (mass), and the organic acid and soap will slowly separate out in the vulcanized rubber network, seriously Affect the oil resistance (such as sealing oil, engine oil and gasoline) of the product, resulting in the dissolution and expansion of the product, the decline of mechanical properties or the defects or disadvantages such as easy damage

Method used

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  • Coagulant for NBR latex coagulation and NBR latex coagulation method

Examples

Experimental program
Comparison scheme
Effect test

example 1

[0034] Add 1.8 liters of deoxidized and deionized water to a 5-liter polymerization kettle under nitrogen protection, then add 60 mL of 15.6% by weight potassium oleate and 40 mL of 25% by weight disproportionated rosin potassium in the polymerization sight glass, containing 0.05 mol iron / L 15mL of mixed aqueous solution of EDTA iron sodium salt and 0.025mol / L EDTA sodium tetraacetate, 13.5% by weight of sodium methylene dinaphthalene sulfonate aqueous solution 18mL, mass concentration of 10% sodium carbonate, sodium phosphate and chloride Add 10, 12 and 15 mL of potassium aqueous solution, 3 mL of 1.4% by weight sodium dithionite aqueous solution, and 10 mL of 6.2% by weight aqueous solution of dithionite, then press the above-mentioned additives into the polymerization kettle with nitrogen gas, start stirring, and then feed 5°C circulating cooling water, and then 260g of acrylonitrile dissolved in 5.8mL of dodecyl mercaptan was injected into a 860mL butadiene metering tank wi...

Embodiment 1

[0036] In the coagulant preparation tank, press soft water: ethanol: calcium chloride: sulfuric acid=444:30:25:1 (mass ratio) ratio to be formulated into coagulant aqueous solution, wherein in the solution, contain calcium chloride 5.2% by weight, ethanol 6.1% by weight %, pH value = 5~6, and then use an acid-resistant pump to continuously and evenly inject into the 5-liter coagulation tank with stirring at a flow rate of 0.5L / min until it is full, and the coagulant after filling passes through the overflow port on the tank Return to the preparation tank through the vibrating filter screen to form a coagulant circulation system. At this time, the NBR latex prepared in Example 1 is continuously and evenly injected into the bottom of the coagulation tank at a flow rate of 0.125 L / min through the latex pump, and the latex is stirred at 23 ° C, 130 rpm under the action of a coagulant, and after 24 seconds White NBR rubber particles with a diameter of 5-30mm emerge from the liquid ...

Embodiment 2

[0041] The relevant conditions in the implementation 1 remain unchanged, only the coagulant is changed into an aqueous coagulant solution in the ratio of soft water: ethanol: alum: sulfuric acid=264:41:28:1 (mass ratio), wherein the solution contains alum 8.3% by weight, 12.3% by weight of ethanol, pH = 5 to 5.5.

[0042] Results During the dehydration process, the pH value of the water extruded by the mill was 6-7;

[0043] The 300% modulus stress of NBR vulcanized rubber was measured to be 11.6 MPa, the breaking strength was 26.4 MPa, and the breaking elongation was 462%; the organic acid content in the raw rubber was 0.40% by weight, and the soap content was 0.16% by weight.

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Abstract

The invention discloses a coagulant for NBR latex coagulation and a method for NBR latex coagulation, the coagulant comprises soft water, inorganic salt, fatty alcohol and a pH value regulator, the coagulant can effectively reduce organic acid and soap compounds in NBR latex, so as to obtain NBR rubber with low organic acid and soap content and oil resistance, and the NBR rubber has the advantages of low organic acid content, low soap content and high oil resistance. Therefore, the requirements of industries such as sealing and oil-resistant molded rubber parts, gaskets, fillers, O-shaped rings, high-elasticity parts, anti-vibration systems, rubber rollers and the like can be met.

Description

technical field [0001] The invention relates to a coagulant, in particular to a coagulant for coagulation of NBR latex, and also relates to a coagulation method of NBR latex, which belongs to the technical field of nitrile rubber synthesis. Background technique [0002] Vulcanization is required in the existing rubber production, and the existing general-type nitrile rubber raw rubber contains 3 to 5% (mass) of organic acids and soaps, and organic acids and soaps remain in the vulcanized rubber products to have a vulcanized network of barrier rubber. The layer will seriously affect the strength of vulcanized rubber, and lead to the decline of oil resistance of rubber products, which is mainly reflected in the increase of oil absorption rate and swelling phenomenon of products. It is particularly important to solve such problems. [0003] In (ancient text. "Research on acrylonitrile-butadiene-isoprene ternary emulsion copolymerization", Dalian University of Technology, June 2...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C08C1/15
CPCC08C1/15
Inventor 张建国王旭李望明许美兰郭灵邢立江刘定伦
Owner CHINA PETROLEUM & CHEM CORP
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