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Method of separating polyethylene wax

A polyethylene wax and monohydric alcohol technology, applied in the field of segmented polyethylene wax, can solve the problems of limited application fields, wide melting range, wide molecular weight distribution, etc., to expand the application field, improve application performance and added value, and simple operation Effect

Inactive Publication Date: 2005-03-23
刘喜军
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

In this way, due to the low purity, wide molecular weight distribution and wide melting range, its application field is severely limited and its utilization value is low.

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0027] With polyethylene wax as raw material, with C 5 ~C 12 Alkanes, aromatics or their mixtures as solvents, with C 2 ~C 4 The monohydric alcohol carries out the following operation steps as precipitating agent:

[0028] a. Dissolution: with C 5 ~C 12 Alkanes, aromatic hydrocarbons or their mixtures are used as solvents to dissolve polyethylene wax, the solvent ratio (weight ratio of solvent to polyethylene wax) is 3-6:1, and the temperature is 20-135°C;

[0029] B, concentration: take the lysate that reaches the dissolution equilibrium of a and carry out distillation and concentration, to a concentration of 10-30% (polyethylene wax content);

[0030] c, precipitation: at room temperature, with C 2 ~C 4 The monohydric alcohol is used as a precipitant to precipitate the concentrated solution of b, and the weight ratio of the precipitant to the concentrated solution is 1~5:1;

[0031] d. Separation: at room temperature, the precipitated liquid is centrifuged;

[0032]...

Embodiment 2

[0035] with C 8 ~C 10 Alkane is used as solvent, ethanol or butanol is used as precipitant to illustrate the method of segmenting polyethylene wax step by step:

[0036] a. Dissolution: at 35-40°C, put C 8 ~C 10 Alkanes and polyethylene wax are dissolved in a weight ratio of 3:1;

[0037] b. Concentration: take the lysate that has reached the equilibrium in a and carry out distillation and concentration until the concentration is 10-20%;

[0038] c. Precipitation: at room temperature, use ethanol or butanol as a precipitant to precipitate the concentrated solution of b, and the weight ratio of the precipitant to the concentrated solution is 1 to 3:1;

[0039] After separation and drying, a polyethylene wax product with an average molecular weight of 1600 is obtained;

[0040] Dissolving temperature ℃

Embodiment 3

[0042] with C 6 ~C 8 Benzene is used as a solvent, ethanol or butanol is used as a precipitating agent to carry out step-by-step segmentation operations on polyethylene wax:

[0043] a. Dissolution: at 20-25°C, put C 6 ~C 8 Benzene and polyethylene wax are dissolved in a weight ratio of 4:1;

[0044] b. Concentration: distill and concentrate the lysate that has reached the dissolution equilibrium in a to a concentration of 20% to 30%;

[0045] c. Precipitation: at room temperature, the concentrated solution of b is precipitated with ethanol or butanol as a precipitant, and the weight ratio of ethanol or butanol to the concentrated solution is 3 to 5:1;

[0046] d. Separating and drying to obtain a polyethylene wax product with an average molecular weight of 1600.

[0047] Dissolving temperature ℃

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Abstract

A process for classifying the polyvinyl wax by molecular weights features that the C5-C12 paraffin, arylhydrocarbon or their mixture is used as solvent, the C2-C4 monoalcohol is used as precipitant, and the classifying procedure for each product includes changing the dissolving temp and solvent ratio, dissolving, concentrating, deposition, separating and drying.

Description

technical field [0001] The invention belongs to a separation method, in particular to a method for dividing polyethylene wax. Background technique [0002] At present, the utilization of low-molecular-weight polyethylene wax, a by-product of polyethylene equipment, is only through simple decolorization or simple melt spraying as filler. In this way, due to the low purity, wide molecular weight distribution and wide melting range, its application field is severely limited, and its utilization value is low. Contents of the invention [0003] The invention aims at solving the deficiencies of the prior art, and provides a method for dividing polyethylene wax. [0004] The technical scheme of the present invention is: take the polyethylene wax with molecular weight between 500-10000 as raw material, with C 5 ~C 12 Alkanes, aromatics or their mixtures as solvents, with C 2 ~C 4 The monohydric alcohol is used as a precipitating agent, and after dissolving, concentrating, pre...

Claims

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Application Information

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IPC IPC(8): C08F6/28C08F110/02
Inventor 刘喜军
Owner 刘喜军
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