Polyolefin carbonization method

A polyolefin and thermoplastic polyolefin technology, applied in the field of carbonization of waste polymers, can solve the problems of a large number of catalysts, high energy consumption, complex process, etc., achieve great industrialization potential, simplify the preparation process, and simple process

Active Publication Date: 2020-02-21
HUAZHONG UNIV OF SCI & TECH
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  • Abstract
  • Description
  • Claims
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Problems solved by technology

[0005] Aiming at the above defects or improvement needs of the prior art, the present invention provides a method for carbonizing polyolefins, which involves mixing and heating polyolefins that are cracked under high temperature conditions and cannot form carbon with biomass containing oxygen-containing functional groups and heated until carbonization temperature, because polyolefin reacts with oxygen to form an oxygen-containing intermediate crosslinking structure during the heating process, and biomass containing oxygen-containing functional groups will generate a large number of intermediate products containing hydroxyl and / or oxygen free radicals during the low-temperature carbonization process, The oxygen-containing intermediate cross-linking structure formed by polyolefin condenses and / or polymerizes with the intermediate product formed by biomass to form a cross-linking structure, inhibits the breakage of the polyolefin main chain, promotes the carbonization of polyolefin, and forms an amorphous carbonized product. This solves the technical problems of the prior art polyolefin recycling carbonization method that requires the use of a large amount of catalysts, high energy consumption, and complicated processes.

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Examples

Experimental program
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Effect test

Embodiment 1

[0042] A carbonization method for polyolefins, comprising the steps of:

[0043] (1) Weigh 0.5g LLDPE (produced by Sinopec Maoming Petrochemical Co., Ltd., molecular weight is 141000g / mol) and 1g starch (produced by Sinopharm Chemical Reagent Co., Ltd.), put them into a ball mill, stir and mix at a speed of 70r / min 5min, a homogeneous mixture of the two was obtained.

[0044] (2) Transfer the mixture to a crucible, put the crucible into a muffle furnace, set the muffle furnace at a heating rate of 5°C / min to the carbonization temperature of 340°C, and keep it at this temperature for 30min.

[0045] (3) After natural cooling in the muffle furnace, the carbonized product was obtained, and the mass was weighed, and the yield was 35 wt%.

[0046] The prepared carbonized products such as figure 1 In the content (a) shown. The product is completely carbon black, indicating that the mixture of LLDPE and starch has been carbonized at 340 ° C, figure 2 The X-ray diffraction patter...

Embodiment 2

[0048] The biomass used in the above-mentioned embodiment 1 is changed from starch to sodium lignosulfonate (produced by Shandong Haobo Chemical Co., Ltd., molecular weight is 52000g / mol), and other steps are unchanged to obtain the joint carbonization product of LLDPE and sodium lignosulfonate, The yield was 56 wt%.

[0049] The prepared carbonized products such as figure 1 In the content (b) shown. The product is completely carbon black, indicating that the mixture of LLDPE and sodium lignosulfonate has been carbonized at 340°C.

[0050] Figure 4 The infrared comparison spectrum shows that heating LLDPE at 340°C will generate a large number of oxygen-containing functional groups such as aldehyde groups, and sodium lignosulfonate will also generate a large number of oxygen-containing functional groups such as hydroxyl groups. After the two are co-carbonized, the obtained carbon material has a large amount of C-O Functional groups, indicating that the aldehyde group of LLD...

Embodiment 3

[0052] The biomass used in the above Example 1 was changed from starch to cellulose (produced by Shanghai Macklin Biochemical Technology Co., Ltd.), and other steps were kept unchanged to obtain a co-carbonized product of LLDPE and cellulose with a yield of 45 wt%.

[0053] The prepared carbonized products such as figure 1 In the content (c) shown. The product is completely carbon black, indicating that the mixture of LLDPE and cellulose has been carbonized at 320°C.

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Abstract

The invention belongs to the technical field of waste polymer carbonization, particularly relates to a polyolefin carbonization method, and more particularly relates to a method for promoting low-temperature and green carbonization of waste polyolefin by using biomass. The method comprises the steps: a mixture of polyolefin and biomass is heated in an oxygen-containing atmosphere, and undergoes acarbonization reaction, wherein the polyolefin is subjected to a reaction with oxygen under heating conditions, an oxygen-containing intermediate cross-linked structure is formed and is subjected to acondensation and/or polymerization reaction with an intermediate product containing hydroxyl and/or oxygen free radicals and formed in the carbonization process of biomass, to form a cross-linked structure, so that the breakage of a polymer main chain is inhibited, the carbonization of polyolefin is promoted, and an amorphous carbonized product is formed. Compared with a traditional carbonizationprocess, the method has the advantages that the energy loss is greatly reduced, the problem that polyolefin is difficult to carbonize under the condition of no catalyst is innovatively solved, and afeasible new technology is provided for large-scale recycling of waste polyolefin in the future.

Description

technical field [0001] The invention belongs to the technical field of carbonization of waste polymers, in particular relates to a carbonization method of polyolefins, and more specifically relates to a low-temperature and green carbonization method of using biomass to promote waste polyolefins. Background technique [0002] In recent years, with the rapid development of petrochemical industry and polymer synthesis technology, the output of organic polymer materials has been greatly improved, and they are widely used in various industries. As the main polymer material, plastics are widely used in chemical industry, construction industry, electronics field and medicine. According to statistics, in 1950, the world's plastic production was only 1.5 million tons, but in 2018 it reached 360 million tons. my country's plastic production also soared from less than 1,000 tons at that time to 80 million tons, becoming the world's largest plastic producer. The largest country in produ...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C01B32/05
CPCC01B32/05
Inventor 龚江张博易郝亮刘宁
Owner HUAZHONG UNIV OF SCI & TECH
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