Graft-modified ultra-high molecular weight ultra-fine polyethylene and its solid-phase grafting method

A technology of ultra-high molecular weight and grafted polyethylene, which is 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 and simple process , the effect of easy industrial production

Active Publication Date: 2019-02-15
INST OF CHEM CHINESE ACAD OF SCI
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

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-modified ultra-high molecular weight ultra-fine polyethylene and its solid-phase grafting method

Examples

Experimental program
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Effect test

preparation example Construction

[0043] The preparation of the above-mentioned powder can adopt the method disclosed in the invention patent application titled "ultra-high molecular weight ultra-fine polyethylene powder and its preparation method" submitted by the applicant on the same day of the application, and the full text of which is incorporated in this application as a reference .

[0044] Specifically, the above-mentioned powder is prepared by the following method: a preparation method of ultra-high molecular weight and ultra-fine particle diameter polyethylene powder, which includes the following steps:

[0045] Under the action of a catalyst, ethylene undergoes a polymerization reaction; wherein, the temperature of the polymerization reaction is -20 to 100°C; in ethylene, the content of carbon monoxide is less than 5ppm, the content of carbon dioxide is less than 15ppm, and the content of conjugated dienes is less than 10ppm;

[0046] The catalyst is prepared by a method comprising the following ste...

preparation example 1

[0105] Preparation Example 1 The preparation of ultra-high molecular weight ultra-fine particle diameter polyethylene powder

[0106] In the reactor fully replaced by high-purity nitrogen, add 4.94g of anhydrous magnesium chloride, 18.9g of isooctyl alcohol, and 30ml of decane in sequence, raise the temperature to 130°C under stirring, and maintain it for 2 hours, then add 2.65g of tetrabutyl titanate The ester and 2.05g of diisobutyl phthalate were reacted at 130°C for 1 hour, and finally cooled to room temperature to form a homogeneous transparent solution, namely mixture I.

[0107] Add 200ml of titanium tetrachloride to the reaction kettle, stir and preheat to 0°C, add the mixture I dropwise to the titanium tetrachloride in about 2 hours. After the dropwise addition was completed, the temperature was raised to 110° C. within 2 hours. 1.23 g of internal electron donor diisobutyl phthalate was added. After reacting at this temperature for 2 hours, remove the reaction liqui...

Embodiment 1

[0112] Preparation of PE-g-MAH: In the reactor fully replaced by high-purity nitrogen, add 40g of polyethylene particles with an average particle diameter of 85 microns prepared in Preparation Example 1 (the standard deviation is 8.21 microns, and the viscosity-average molecular weight is 1.3× 10 6 , molecular weight distribution is 9.2), add 2.0g benzoyl peroxide, add 2.8g maleic anhydride (MAH), add 4mL tetrahydrofuran and 5mL xylene; then turn on the mechanical stirring, stir rapidly for 3 hours; finally put the reactor into In an oil bath at 100°C, react for 2 hours to obtain the crude grafted product.

[0113]Refining of PE-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.

[0114] Infrared chara...

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Abstract

The invention provides a method for adopting solid phase grafting for preparing grafted polyethylene from ultra-high molecular weight superfine polyethylene and grafted polyethylene prepared through the same. The effective grafting rate of a grafting monomer is larger than 0.5%, a basic polymer is polyethylene, the polyethylene is powder and spherical or spherical-like granulates, and the average grain diameter is 10-100 micrometers; the standard deviation is 2-15 micrometers, and the bulk density is 0.1-0.3 g / mL; the viscosity average molecular weight (Mv) of the polyethylene is larger than 1*10<6>. The method is simple in technology, low in cost and easy to implement, and promotes industrial production. The thermal property, mechanical property, polarity and the like of the grafted polyethylene are obviously improved, and the original good performance of the polyethylene is kept.

Description

technical field [0001] The invention relates to a graft polymer and a preparation method thereof, in particular to a graft modified ultrahigh molecular weight ultrafine particle diameter polyethylene and a solid phase grafting method thereof. Background technique [0002] As a general-purpose plastic, polyethylene is known for its large output, wide range of applications, and high quality and low price. However, polyethylene has poor cold resistance, weather resistance, light resistance, dyeability, adhesiveness, antistatic property, and hydrophilicity. , and poor compatibility with other polar polymers, inorganic fillers and reinforcing materials, these shortcomings restrict the application of polyethylene in the field of packaging materials, automotive industry, electronics industry and medical equipment. [0003] In order to improve the performance of polyethylene and expand its application range, it is necessary to modify polyethylene. There are many ways to modify poly...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C08F255/02C08F222/06C08F220/06C08F220/14
Inventor 李化毅李倩孙同兵朱才镇刘瑞刚赵宁徐坚
Owner INST OF CHEM CHINESE ACAD OF SCI
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