Process for producing nitrile-butadiene rubber (NBR) and polrvinyl chloride (PVC) mixed rubber by latex coprecipitation method

A technology of nitrile rubber and polyvinyl chloride, which is applied in the field of chemical product preparation, can solve the problems of poor molecular dispersion, unused, poor performance, etc., and achieve outstanding ozone aging resistance, energy saving, and good fluidity Effect

Inactive Publication Date: 2012-11-28
天津市铭仁化工科技有限公司
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  • Summary
  • Abstract
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Problems solved by technology

This process method has high energy consumption and poor molecular dispersion effect. Although the performance of the finished product can meet the needs of downstream production, the performance is much worse than that of the blend glue produced by the emulsion co-precipitation method.
[0006] 3. The use of emulsion co-precipitation method to produce NBR / PVC blended rubber has not been used in my country due to the limitation of production conditions.

Method used

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Embodiment Construction

[0018] A process for producing nitrile rubber and polyvinyl chloride mixed rubber by using the emulsion co-precipitation method. The nitrile rubber and polyvinyl chloride are mixed uniformly at a ratio of 3:1 at 65°C to make an NBR / PVC mixed emulsion. The NBR / PVC mixed emulsion is cured by adding dibutyltin laurate, and finally a flocculant is added to make the NBR / PVC mixed emulsion undergo co-precipitation, coagulation and drying to obtain a finished product. The adding amount of the above dibutyltin laurate is 1%-2% of the NBR / PVC mixed emulsion. The above-mentioned flocculant adopts 20% sodium chloride solution, and its addition amount is 10% of the NBR / PVC mixed emulsion. Dicyandiamine formaldehyde condensate can also be used, and its addition amount is 1-2% of the NBR / PVC mixed emulsion.

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PUM

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Abstract

The invention discloses a process for producing NBR and PVC mixed rubber by using a latex coprecipitation method, which comprises: uniformly mixing NBR and PVC at 50 to 70 DEG C according to a ratio of 3:1 to prepare NBR / PVC mixed latex; and adding a deflocculant into the NBR / PVC mixed latex for curing, adding a flocculating agent at last to perform coprecipitation and flocculation in the NBR / PVCmixed latex, and drying the flocculate to obtain the finished product. The production process is simple, easy and low in energy consumption, and the produced NBR / PVC blended rubber has high performance.

Description

Technical field: [0001] The invention belongs to a preparation method of chemical products, and particularly relates to a process for producing nitrile rubber and polyvinyl chloride mixed rubber by using a co-precipitation method. Background technique: [0002] NBR / PVC blends obtained by blending nitrile rubber (NBR) and polyvinyl chloride (PVC) have the following advantages: 1. Good ozone and weather resistance, reaching or even exceeding the level of chloroprene rubber (CR). 2. Oil resistance, especially resistance to fuel oil and ethanol gasoline is improved. 3. Improved solvent and chemical resistance, wear resistance and tear resistance. 4. It is flame retardant and resistant to flexing and cracking. [0003] At present, there are three manufacturing methods for NBR / PVC blends: mechanical blending, emulsion co-precipitation and solution blending. Among them: [0004] 1. The solution blending method is no longer used in industry. [0005] 2. The mechanical blending method is cu...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C08J3/00C08L9/02C08L27/06
Inventor 王刚
Owner 天津市铭仁化工科技有限公司
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