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A kind of graphene/vinyl chloride in-situ polymerization method

An in-situ polymerization, graphene technology, applied in the field of nanomaterials, can solve the problems of inability to achieve monolayer, nanoscale dispersion, demulsification, difficult to implement, etc., achieve thermodynamic stability, ensure dispersibility, and disperse particle size. small effect

Active Publication Date: 2016-06-29
XINJIANG ZHONGTAI CHEM CO LTD +1
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0010] The preparation method of this graphene / polyvinyl chloride composite material relies on dispersants, emulsifiers and high-speed mixers to disperse graphene, but because dispersants and emulsifiers are simply added at one time, and there is no ultrasonic treatment, graphene cannot Interlayer exfoliation cannot achieve the monolayer and nano-scale dispersion required for in-situ polymerization, and can only achieve micron-scale dispersion at most. Graphene is basically dispersed in the medium in a multi-layer form.
Even if there is a small amount of graphene to form an emulsion, because there is no suitable micelle protective agent, it will break the emulsion soon, forming a coarse particle size emulsion or even a suspension, which does not have the characteristics of nanomaterials
[0011] In addition, in the preparation method of this graphene / polyvinyl chloride composite material, before polymerization, the graphene emulsion in step 2 is added while adding monomers, which changes the feeding order of the original vinyl chloride suspension polymerization system. The monomer needs to be fed under high pressure, which brings great difficulties to the polymerization process; at the same time, it will make the granulation process of polyvinyl chloride suspension polymerization difficult to control
In summary, these problems make it difficult to implement this technical route in industrial production

Method used

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  • A kind of graphene/vinyl chloride in-situ polymerization method
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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0031] A kind of graphene / vinyl chloride in-situ polymerization method specifically comprises the following steps:

[0032]Step 1: Add 400mL deionized water to the flask; add 3g of intercalation agent sodium lauryl sulfate, fully dissolve; add 5g of graphene, stir and disperse for 15 minutes; put it into an ultrasonic processor for 15 minutes, and the ultrasonic power is 500 watts; Raise the temperature to 70°C, add 2.4 g of n-hexadecyl alcohol as an emulsifying micelle protective agent; add 200 mL of a 2% aqueous solution of hydroxypropyl methylcellulose ether, and stir thoroughly; put it into an ultrasonic processor for processing, with an ultrasonic power of 500 watts, and The time is 60 minutes.

[0033] Step 2: In situ polymerization of graphene / vinyl chloride. In a 20L stainless steel reaction kettle, add 10kg of deionized water; start stirring, add polyvinyl alcohol as a dispersant, and ammonium bicarbonate as a pH buffer; then add 600mL of the aforementioned in-situ p...

Embodiment 2

[0036] A kind of graphene / vinyl chloride in-situ polymerization method specifically comprises the following steps:

[0037] Step 1: Add 400mL deionized water to the flask; add 5g of sodium dodecylbenzenesulfonate as an intercalation agent, and fully dissolve; add 10g of graphene, stir and disperse for 15 minutes; put it into an ultrasonic processor for 30 minutes, and the ultrasonic power is 1000 Watts; heat up to 70°C, add 10g of n-stearyl alcohol, an emulsifying micellar protective agent; add 200mL of hydroxypropyl methylcellulose ether aqueous solution with a concentration of 2%, and stir thoroughly; put it into an ultrasonic processor for processing, and the ultrasonic power is 1000 watts, Processing time 120 minutes.

[0038] Step 2: In situ polymerization of graphene / vinyl chloride. In a 20L stainless steel reaction kettle, add 10 kg of deionized water; start stirring, add dispersant hydroxypropyl methylcellulose, pH buffer agent ammonia water; add the aforementioned in...

Embodiment 3

[0041] A kind of graphene / vinyl chloride in-situ polymerization method specifically comprises the following steps:

[0042] Step 1: Add 400mL deionized water to the flask; add 5g of sodium dodecyl sulfate and 5g of sodium dodecylbenzenesulfonate as intercalation agents, and fully dissolve; add 50g of graphene, stir and disperse for 15 minutes; put into ultrasonic treatment 15 minutes, ultrasonic power 2000 watts; heat up to 70 ° C, add emulsified micelles protective agent n-heptadecanol 30g, concentration of 2% hydroxypropyl methylcellulose ether aqueous solution 200mL, fully stir; put into ultrasonic processor For processing, the ultrasonic power is 2000 watts, and the processing time is 60 minutes.

[0043] Step 2: In situ polymerization of graphene / vinyl chloride. In a 20L stainless steel reaction kettle, add 10kg of deionized water; start stirring, add polyvinyl alcohol as a dispersant, and ammonium bicarbonate as a pH buffer; then add 600mL of the aforementioned in-situ ...

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Abstract

The invention discloses a graphene / vinyl chloride in-situ polymerization method. Using mechanical ultrasonic dispersion and microemulsion dispersant system to obtain in-situ polymerization grade graphene microemulsion, adding graphene microemulsion into vinyl chloride suspension polymerization system, vinyl chloride monomer and graphene are in-situ polymerized to obtain in-situ polymerized Graphene / polyvinyl chloride resin. Observation by transmission electron microscope (TEM) shows that graphene is dispersed in a nanoscale monolayer in the polyvinyl chloride resin matrix, and the thermal aging performance and mechanical properties of the resin are significantly improved.

Description

technical field [0001] The invention belongs to the field of nanometer materials, and in particular relates to a graphene / vinyl chloride in-situ polymerization method. Background technique [0002] Polyvinyl chloride is the second largest general-purpose resin in the world after polyethylene resin. It has the outstanding characteristics of abundant raw materials, mature manufacturing process, low price and wide application. PVC is easy to process and can be processed by molding, lamination, injection molding, extrusion, calendering, blow molding, etc. Polyvinyl chloride is mainly used in the production of soft plastic products such as artificial leather, film, and wire sheaths, as well as hard plastic products such as plates, doors and windows, pipes, and valves. [0003] Polyvinyl chloride has the advantages of good flame retardancy, high chemical resistance, good mechanical strength and electrical insulation, but its heat resistance is poor, and its performance needs to b...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C08F114/06C08F2/44C08F2/20C08K9/04C08K9/00C08K3/04
Inventor 赵永禄王雅玲李波王猛韩和良
Owner XINJIANG ZHONGTAI CHEM CO LTD
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