High-grafting-ratio maleic anhydride graft polypropylene material and preparation method thereof

A technology of grafting polypropylene and maleic anhydride, which is applied in the field of high grafting ratio maleic anhydride grafted polypropylene materials and its preparation, and can solve the problem of irritating odor caused by sublimation, affecting the performance of grafts, increasing processing difficulty, etc. problems, to achieve the effect of enhanced operability, reduced melt flow rate, and increased grafting rate

Inactive Publication Date: 2015-05-06
GUIZHOU UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0003] There are many methods for grafting modification of polypropylene, mainly monomer polymerization method, solution method, melting method, solid phase method, etc. The melt reaction extrusion method has simple process operation, continuous production, and low equipment investment. The advantages have been widely used. Maleic anhydride is the most commonly used monomer for grafting polypropylene with polar monomers. This reaction is a free radical reaction, but the macromolecular free radicals produced by the initiator decompose free radicals have a short survival period, and Maleic anhydride is sublimated at high temperature, resulting in low grafting rate; during the production process, the sublimation of maleic anhydride produces irritating odor, which affects health; especially the β-breakage of polypropylene molecular chain is difficult to control during the grafting process, which will cause Excessive degradation of polypropylene affects the properties of grafts and makes processing more difficult
[0004] In order to solve the problems of low grafting rate and severe degradation of polypropylene, most patents and reports add the second monomer or the third monomer to the grafting system to increase the grafting rate

Method used

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  • High-grafting-ratio maleic anhydride graft polypropylene material and preparation method thereof
  • High-grafting-ratio maleic anhydride graft polypropylene material and preparation method thereof
  • High-grafting-ratio maleic anhydride graft polypropylene material and preparation method thereof

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Effect test

Embodiment 1

[0016] Example 1 of the present invention: high grafting rate maleic anhydride grafted polypropylene material, 11 experimental groups were established, the raw materials were calculated in parts by mass, each group included 100 parts of homopolypropylene (T30S), 2 parts Maleic anhydride and 0.25 part of dicumyl peroxide, the consumption of zinc dimethyl dithiocarbamate are as shown in table 1.

[0017]

[0018] The preparation method of maleic anhydride grafted polypropylene material with high grafting rate, according to the above-mentioned mass fraction, after fully mixing maleic anhydride, polypropylene, initiator and zinc dithiocarbamate, add it into a twin-screw extruder In the process, extrude under the condition of 160-210°C, the temperature design of the extruder is shown in Table 2, and granulate and dry to obtain the finished product; the diameter of the extruder is 60mm, the aspect ratio is 40, and the speed of the main engine is 300r / min.

[0019]

[0020] Ta...

Embodiment 2

[0022] Embodiment 2 of the present invention: the preparation of high grafting rate maleic anhydride grafted polypropylene material, set up 10 experimental groups, its preparation raw material is calculated by mass parts, each group of raw materials and preparation process are as shown in table 4:

[0023]

[0024]

[0025] The extruder temperature setting is according to Table 2; maleic anhydride, polypropylene, initiator and zinc dithiocarbamate are weighed according to the experimental formula in Table 4 and mixed uniformly in a high-speed mixer at room temperature, and then added to the twin-screw extruder In the machine, it was kneaded and extruded according to the process in Table 4, and granulated and dried.

[0026] Weigh each group of products prepared in the same amount of Example 2 respectively, measure the melt flow rate of the product, then add the product to xylene and boil to dissolve, then pour the solution into excess acetone to precipitate while it is ho...

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Abstract

The invention discloses a high-grafting-ratio maleic anhydride graft polypropylene material and a preparation method thereof. By adopting zinc dithiocarbamate as a stabilizer for macromolecular free radicals, the stability of the macromolecular free radicals is increased, the decomposition of the macromolecular free radicals is inhibited and thus the chain degradation is decreased and meanwhile, the reaction time of the macromolecular free radicals and graft monomer is prolonged so that the grafting ratio is increased, the maleic anhydride graft polypropylene material with high grafting ratio and low degradation is prepared and the grafting ratio can be doubled compared to that of the general grafting modification scheme; the degradation of polypropylene is inhibited, the flow rate of a melt is greatly reduced so that the operability of the production process is enhanced.

Description

technical field [0001] The invention relates to the field of polymer material science, in particular to a maleic anhydride grafted polypropylene material with a high grafting rate and a preparation method thereof. Background technique [0002] Polypropylene is a plastic with excellent properties and plays an important role in the production and application of polyolefins. However, polypropylene has poor hydrophilic properties, poor colorability and adhesion, and poor compatibility with polar polymer materials. The grafting of unsaturated polar monomers (such as maleic anhydride) to the macromolecular chain of polypropylene can effectively improve the hydrophilicity of polypropylene. Maleic anhydride-grafted polypropylene can effectively improve the compatibility between polypropylene materials and polar materials. [0003] There are many methods for grafting modification of polypropylene, mainly monomer polymerization method, solution method, melting method, solid phase me...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C08F255/02C08F222/06C08K5/39
Inventor 罗筑娄金芬秦舒浩何敏鲁圣军
Owner GUIZHOU UNIV
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