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
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[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 reference reagent anhydrous sodium carbonate, which is burnt to constant weight in a high temperature furnace at 270℃-300℃, and dissolve it in 50ml 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 it for 2 minutes, continue to titrate after cooling until the solution turns dark red again, and do a blank experiment. Then the concentration of the hydrochloric acid standard solution is C HCL =1000m / (V 1 -V 2 ) M, where M is 52.994, which is half the molecular weight of sodium carbonate; V 1 Is the volume of hydrochloric acid solution consumed in t...
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[0044] Example 1
[0045] a. Count in parts by weight, weigh 0.4 part of initiator DTBP and 0.6 part of styrene, and mix well;
[0046] b. Count 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 add the mixture obtained in step a dropwise at the same time;
[0047] c. The mixture obtained in step b is added to a twin-screw extruder, blended and extruded, and then melt-grafted to prepare maleic anhydride grafted polypropylene. The measured grafting rate is 0.51%. .
[0048] The diameter of the twin-screw extruder is 30mm, the ratio of length to diameter is 35, the main engine speed is 200r / min, the feeding speed is 40r / min, and the temperature settings are: zone 1 100℃, zone 2 160℃, zone 3 180℃, zone 4 190 ℃, 5 zone 190℃, 6 zone 190℃, machine head 190℃.
Example Embodiment
[0049] Example 2
[0050] a. Count in parts by weight, weigh 2 parts of initiator DTBP and 2 parts of styrene, and mix well;
[0051] b. Count in parts by weight, add 100 parts of polypropylene 1215C and 2 parts of maleic anhydride in a high-speed mixer, mix for 3 minutes, and add the mixture obtained in step a dropwise at the same time;
[0052] c. The mixture obtained in step b is added to a twin-screw extruder, blended and extruded, and then melt-grafted to prepare maleic anhydride grafted polypropylene. The measured grafting rate is 1.41%.
[0053] The diameter of the twin-screw extruder is 92mm, the ratio of length to diameter is 52, the main engine speed is 360r / min, the feeding speed is 60r / min, and the temperature settings are: zone 1 100℃, zone 2 130℃, zone 3 160℃, zone 4 175 ℃, zone 5 190℃, zone 6 200℃, zone 7 200℃, zone 8 200℃, zone 9 200℃, zone 10 200℃, zone 11, 200℃, zone 12 200℃, machine head 210℃.
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