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: 2011-08-03
天津市铭仁化工科技有限公司
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  • 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 kind of technology that utilizes emulsion co-precipitation method to produce nitrile rubber and polyvinyl chloride mixed rubber, at 65 ℃, nitrile rubber and polyvinyl chloride are mixed according to the ratio of 3:1 to make NBR / PVC mixed emulsion, and then Dibutyltin laurate is added to the NBR / PVC mixed emulsion for curing, 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 addition amount of the above-mentioned 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 NBR / PVC mixed emulsion, and dicyandiamine formaldehyde condensate can also be used, and its addition amount is 1-2% of NBR / PVC mixed emulsion.

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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 / PVC mixed 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, in particular to a process for producing acrylonitrile-butadiene rubber and polyvinyl chloride mixed rubber by co-precipitation method. Background technique: [0002] The NBR / PVC blended rubber obtained by blending nitrile rubber (NBR) and polyvinyl chloride (PVC) has the following advantages: 1. Good ozone resistance 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, abrasion resistance and tear resistance. 4. It is flame retardant and resistant to flex cracking. [0003] At present, there are three manufacturing methods of NBR / PVC blended rubber: mechanical blending method, emulsion coprecipitation method and solution blending method, among which: [0004] 1. The solution blending method has not been used in indu...

Claims

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Application Information

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Patent Type & Authority Applications(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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