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Graft modification ultrafine polyolefin and solid-phase grafting method thereof

A technology of solid-phase grafting and polyolefin, applied in the field of grafted polymers and its preparation, can solve problems such as increased production costs, complex reaction processes, and difficulty in achieving large-scale low-cost production, and achieves low cost, simple process, The effect of increasing the specific surface area

Active Publication Date: 2017-01-04
INST OF CHEM CHINESE ACAD OF SCI
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

Although these methods can reduce the grafting temperature and grafting time and improve the grafting rate to a certain extent, the entire reaction process operation is too complicated, and new media or equipment are introduced, which greatly increases the production cost and is difficult to obtain. Achieve large-scale low-cost production

Method used

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  • Graft modification ultrafine polyolefin and solid-phase grafting method thereof
  • Graft modification ultrafine polyolefin and solid-phase grafting method thereof
  • Graft modification ultrafine polyolefin and solid-phase grafting method thereof

Examples

Experimental program
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Effect test

Embodiment 1

[0042] Preparation of PP-g-MAH: In a reactor fully replaced by high-purity nitrogen, add 40g of 5 Add 2.0g of benzoyl peroxide, 2.8g of maleic anhydride (MAH), 4mL of tetrahydrofuran and 5mL of xylene; then turn on the mechanical stirring and stir rapidly for 4 hours; finally put the reactor at 120°C In an oil bath, react for 2 hours to obtain the product.

[0043] Refining of PP-g-MAH: Weigh about 4g of crude graft, add 200mL of xylene into a 500mL distillation flask, heat and dissolve, reflux for 4h, add acetone (about 200mL) after cooling, shake well, let it settle and filter , and then washed once with acetone, put the filtrate in a 50°C oven to dry for 12 hours, and cool to obtain a refined graft.

[0044] Infrared characterization of PP-g-MAH: measure the infrared spectrum of the refined graft according to the aforementioned method, the results are shown in figure 1 , where the upper part is the polypropylene raw material; the lower part is the grafted polymer. 1862cm...

Embodiment 2

[0051] Preparation of PP-g-MAH: In a reactor fully replaced by high-purity nitrogen, add 40g of 4 Add 2.0g of azobisisobutyronitrile, 2.8g of maleic anhydride (MAH), 3mL of tetrahydrofuran and 6mL of xylene; then turn on mechanical stirring and stir rapidly for 4 hours; finally put the reactor into 120 In an oil bath at ℃, react for 2 hours to obtain the product. The effective grafting rate of maleic anhydride of the grafted polymer was measured to be 3.25%, and the water contact angle of the grafted polymer was 74°.

Embodiment 3

[0053] Preparation of PP-g-AA: In a reactor fully replaced by high-purity nitrogen, add 40g of 6 Add 2.0g of benzoyl peroxide, 2.8g of acrylic acid (AA), and 5mL of xylene; then turn on the mechanical stirring and stir rapidly for 4 hours; finally add the reactor and put it in an oil bath at 120°C, After 2 hours of reaction, the product was obtained. It is measured that the effective grafting rate of acrylic acid of the grafted polymer is 3.14%, and the water contact angle of the grafted polymer is 70°.

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Abstract

The invention provides a method for preparing a grafted polymer by performing solid-phase grafting on ultrafine polyolefin and the grafted polymer prepared by the method. The method comprises the following steps: adding polyolefin, a grafting monomer, an initiator and an interfacial agent into a container, and uniformly stirring and mixing the materials; heating for solid-phase grafting reaction; obtaining the grafted polymer, wherein the polyolefin is granular, and the average particle size is 20 to 300 microns; a standard deviation is 2 to 15 microns. Compared with other methods for preparing high-grafting-rate grafted polymer, the method provided by the invention is simpler and more effective, and is easy to operate; the heat performance, the mechanical property, the polarity and the like of the grafted polymer are obviously improved, and the original good performance of the polyolefin is retained.

Description

technical field [0001] The invention relates to a graft polymer and a preparation method thereof, in particular to a graft modified polyolefin with ultrafine particle size and a solid-phase graft method thereof. Background technique [0002] Polyolefins, take polypropylene as an example. As a general-purpose plastic, polypropylene is famous for its large output, wide range of applications, and high quality and low price. However, these polyolefins have cold resistance, weather resistance, light resistance, dyeability, adhesion, The antistatic property and hydrophilicity are very poor, and the compatibility with other polar polymers, inorganic fillers and reinforcing materials is also very poor. These shortcomings restrict the application of polyolefins (such as polypropylene) in the field of packaging materials and the automotive industry. , electronics industry and medical equipment and other applications. [0003] In order to improve the performance of polyolefin and expa...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C08F255/02C08F222/06C08F220/06C08F220/14C08F255/10C08F255/04C08F2/36
CPCC08F2/36C08F255/02C08F255/04C08F255/10C08F222/06C08F220/06C08F220/14
Inventor 李化毅罗志张辽云李倩胡友良
Owner INST OF CHEM CHINESE ACAD OF SCI
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