Method for preparing polyethylene wax in solvent

A polyethylene wax and low-molecular-weight polyethylene technology, applied in the field of polymer wax synthesis, can solve the problems that the specific conditions of the raw materials have not been investigated and analyzed, and the problems have not been sufficiently analyzed, so as to prevent excessive cracking and carbon deposition, Good for heat transfer and easy separation

Active Publication Date: 2010-06-09
BEIJING INSTITUTE OF PETROCHEMICAL TECHNOLOGY
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  • Abstract
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Problems solved by technology

Analyzing the above pyrolysis wax production process, it is found that there are the following problems: 1. There is no investigation and analysis of the specific conditions of the raw materials
Polyethylene can also be divided into HDPE (HDPE), LDPE (LDPE), LLDPE (linear low-density polyethylene), etc., especially HDPE and LDPE; 2. The problems existing in industrial production have not been sufficiently analyzed
In actual industrial production, there may be many problems in the improvement of heat transfer, the prevention of coking and the prevention of pollution, etc., which are not discussed in the above patents

Method used

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  • Method for preparing polyethylene wax in solvent
  • Method for preparing polyethylene wax in solvent

Examples

Experimental program
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Effect test

Embodiment 1

[0012] Take about 100g of high-density polyethylene (HDPE) into the autoclave, add 100ml of the selected solvent (water, cyclohexane, tetrahydronaphthalene), seal the autoclave, and purge the autoclave with nitrogen for about 10 minutes to replace and remove the air in the autoclave. Turn on the stirring device, raise the temperature to 360°C for 8 hours, cool down to room temperature, discharge, filter and dry, recover part of the solvent, and obtain low molecular weight polyethylene wax. The results are shown in Table 1.

[0013] The reaction results of different solvents in table 1

[0014]

[0015] As can be seen from Table 1, the polyethylene wax synthesized with tetralin and cyclohexane is a white powder, and the raw materials do not have entanglement phenomenon, but the tetralin boiling point is high, so the solvent recovery rate is higher; Polyethylene wax can be obtained, but the molecular weight is relatively high, and the raw materials are entangled on the stirre...

Embodiment 2

[0017] Using LDPE, HDPE and discarded PE packaging bags as raw materials, tetralin as the reaction solvent, the method is the same as in Example 1, and the results are shown in Table 2.

[0018] The comparison result of different reaction raw materials of table 2

[0019]

[0020] It can be seen from Table 2 that all three kinds of raw materials can be used to prepare low molecular weight polyethylene wax, the difference is that the color of the product prepared from waste plastics is slightly yellow.

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Abstract

The invention relates to a preparation method for preparing polyethylene wax by using a solvent, which comprises the steps of increasing the temperature of 100g of raw materials to the reaction temperature under the action of 100ml of the solvent, cracking for a certain time, reducing the temperature to the room temperature, discharging the materials, carrying out treatment, and obtaining the lowmolecular weight polyethylene wax; the raw materials comprise high-density polyethylene, low density polyethylene and self-collected waste polyethylene PE which is obtained by washing and cutting plastic bags; the solvent comprises water, cyclohexane and tetralin; the reaction temperature is generally from the boiling point of the solvent to 500 DEG C; and the cracking time is 2-24h. The prepration method has the advantages that a solvent system can lead the reaction to carry out more uniformly, thereby effectively preventing excessive cracking and carbon deposition phenomenon, preventing thepartial reaction raw materials from winding and concentrating on a stirrer and leading a product to be separated easily.

Description

technical field [0001] The invention relates to a synthesis method of polymer wax, in particular to a method for preparing polyethylene wax (PEW) with a solvent. Background technique [0002] Polyethylene wax has high added value, high production cost and high price, and the domestic production is in short supply. Ordinary polyethylene wax is mainly used in glazing agents such as leather shoe polish, and the dosage is not much, while modified wax and oxidized wax are used in large amounts, which have the functions of lubrication, film release, and pigment dispersion, and also have anti-scratch effects on the coating film. important function. In terms of ink, no matter it is gravure, letterpress, water-based or oil-based ink, it is inseparable from oxidized polyethylene wax, which can improve the anti-caking property while improving the wear resistance. In fabric finishing, it can not only improve the manufacturability of the spinning process, but also ensure the product qu...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C08F8/50C08F110/02C08J11/14C08J11/20C08L23/06
CPCY02W30/62
Inventor 迟姚玲易玉峰丁福臣冀德坤范成伟王莹王虹
Owner BEIJING INSTITUTE OF PETROCHEMICAL TECHNOLOGY
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