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Preparation method for maleic anhydride-grafted polypropylene

A technology of grafting polypropylene and maleic anhydride, which is applied in the field of preparation of maleic anhydride grafted polypropylene, can solve problems such as high cost of maleic anhydride grafted polypropylene, difficulty and cost of industrialization, and complicated preparation process , to achieve the effects of short reaction time, low production cost and simple preparation

Active Publication Date: 2014-05-07
HEFEI GENIUS NEW MATERIALS
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  • Description
  • Claims
  • Application Information

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Problems solved by technology

[0004] Chinese patent CN101724148B discloses a kind of maleic anhydride grafted polypropylene that can obtain higher molecular weight and melt strength, but only applicable to polypropylene powder, not suitable for polypropylene pellets; this method needs to add antioxidant, And the preparation process is complicated, resulting in higher cost of maleic anhydride grafted polypropylene
[0005] Chinese patent CN101492517B discloses a method for preparing maleic anhydride grafted polypropylene by solid-phase free radical graft polymerization. This method takes a long time to react and greatly increases the difficulty and cost of industrialization

Method used

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  • Preparation method for maleic anhydride-grafted polypropylene

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preparation example Construction

[0039] The preparation method of 0.5mol / L hydrochloric acid standard solution is as follows:

[0040] Weigh 22ml of hydrochloric acid, dilute to 500ml of water, and shake well.

[0041] The calibration method of 0.5mol / L hydrochloric acid standard solution is as follows:

[0042] Weigh 0.95g of the working standard reagent anhydrous sodium carbonate, which is burned in a high-temperature furnace at 270°C-300°C to constant weight, dissolve it in 50ml of water, add 10 drops of bromocresol green-methyl red indicator solution, and use the prepared Titrate the hydrochloric acid solution until the solution turns from green to dark red, boil for 2 minutes, continue to titrate after cooling until the solution turns dark red again, and do a blank experiment at the same time. Then the concentration of the standard solution of hydrochloric acid is C HCL =1000m / (V 1 -V 2 ) M, where M is 52.994, which is half of the molecular weight of sodium carbonate; V 1 is the volume of hydrochlor...

Embodiment 1

[0045] a. count by weight, take by weighing 0.4 part of initiator DTBP, 0.6 part of styrene, and mix uniformly;

[0046] b. Counting in parts by weight, add 100 parts of polypropylene T30S and 0.6 parts of maleic anhydride to a high-speed mixer, mix for 1 min, and simultaneously add the mixture obtained in step a dropwise;

[0047] c. The mixture obtained in step b is added to a twin-screw extruder, blended and extruded, and melt grafted to prepare maleic anhydride grafted polypropylene, and the measured grafting rate is 0.51%. .

[0048]The diameter of the twin-screw extruder is 30mm, the aspect ratio is 35, the speed of the main engine is 200r / min, the speed of feeding is 40r / min, and the temperature is set as: 1 zone 100°C, 2 zone 160°C, 3 zone 180°C, 4 zone 190 ℃, zone 5 190℃, zone 6 190℃, head 190℃.

Embodiment 2

[0050] a. count by weight, take by weighing 2 parts of initiator DTBP, 2 parts of styrene, mix uniformly;

[0051] b. Counting in parts by weight, add 100 parts of polypropylene 1215C and 2 parts of maleic anhydride to a high-speed mixer, mix for 3 minutes, and simultaneously add the mixture obtained in step a dropwise;

[0052] c. The mixture obtained in step b was added to a twin-screw extruder, blended and extruded, and melted and grafted to prepare maleic anhydride grafted polypropylene, and the measured grafting rate was 1.41%.

[0053] The diameter of the twin-screw extruder is 92mm, the length-to-diameter ratio is 52, the main engine speed is 360r / min, the feeding speed is 60r / min, and the temperature settings are: 1 zone 100°C, 2 zone 130°C, 3 zone 160°C, 4 zone 175 ℃, zone 5 190°C, zone 6 200°C, zone 7 200°C, zone 8 200°C, zone 9 200°C, zone 10 200°C, zone 11 200°C, zone 12 200°C, head 210°C.

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Abstract

The invention relates to a preparation method for maleic anhydride-grafted polypropylene. The preparation method comprises the following steps: (1) uniformly mixing 0.4 to 2 parts of an initiator and 0.6 to 2 parts of styrene by weight; (2) adding 110 parts of polypropylene and 0.6 to 2 parts of maleic anhydride by weight into a high-speed mixing machine and mixing for 1 to 3 minutes, and meanwhile dropwise adding the product obtained by the step (1); (3) adding the product obtained by the step (2) into a double-screw extruder, blending, extruding, melting and grafting to prepare the maleic anhydride-grafted polypropylene. Compared with the prior art, the preparation method has short reaction time, simple preparation and low production cost, and is suitable for industrialization; an anti-oxidant is not required to be added; the effective reaction time can be prolonged by controlling the factors, such as the rotating speed of a main machine, the feeding rotating speed, the temperature and the like; meanwhile, the maleic anhydride-grafted polypropylene with high grafting rate can be obtained by adding the styrene, so that the grafting efficiency of maleic anhydride is improved; the preparation method does not have special requirements on the double-screw extruder, a liquid feeding device is not required, and the length-diameter selection range is large.

Description

technical field [0001] The invention belongs to the technical field of polymer material processing, and in particular relates to a preparation method of maleic anhydride grafted polypropylene. Background technique [0002] Maleic anhydride grafted polypropylene (referred to as PP-g-MAH) is a common and effective compatibilizer, which is widely used in modified plastics and can be prepared by a variety of methods. In comparison, the melt grafting method is The preparation method is simple in operation, low in cost and suitable for industrialization. [0003] Grafting rate is an important parameter to judge the quality of maleic anhydride grafted polypropylene. For a long time, the maleic anhydride grafted polypropylene was prepared by the melt grafting method, and the grafting rate of the obtained maleic anhydride grafted polypropylene was low. Adding styrene in the formula can greatly increase the grafting rate and obtain high-quality maleic anhydride grafted polypropylene...

Claims

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Application Information

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IPC IPC(8): C08F255/02C08F222/06C08F212/08B29C47/92B29C48/92
CPCB29C48/40B29C48/625B29C48/875B29C48/92B29C2948/9259B29C2948/926B29C2948/92704B29C2948/92885B29C2948/92895
Inventor 杨桂生程伟孙利明姚晨光
Owner HEFEI GENIUS NEW MATERIALS
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