Method for preparing colored polyester in chain decomposing mode through waste polyester

A technology of colored polyester and waste polyester, which is applied in the preparation of carboxylic acid esters, chemical instruments and methods, and the preparation of organic compounds, etc., which can solve the problems of unstable performance of recycled polyester, poor hue of recycled polyester, and difficult content of by-products Control and other issues to achieve the effect of stabilizing quality, reducing production, and improving chain solution efficiency

Active Publication Date: 2020-01-17
宁波大发新材料有限公司
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Recycling polyester by chemical method can theoretically reach the level of virgin polyester, and can be chemically modified, but in fact, because the raw material contains many impurities, there are problems such as unstable performance of recycled polyester and difficult control of by-product content. Some raw materials contain a variety of dyes, resulting in poor hue of recycled polyester products

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0040] A precipitant for removing impurities in the chain solution of waste polyester products, the precipitant consists of the following components:

[0041] Nano calcium oxide 6 parts

[0042] 4 parts diatomaceous earth

[0043] Nano-alumina 10 parts

[0044] Potassium hydroxide 3 parts

[0045] 4 parts calcium carbonate

[0046] Sodium hydroxyethyl cellulose 2 parts

[0047] 4 parts polyacrylamide;

[0048] Add nano-calcium oxide, diatomaceous earth, nano-alumina, calcium carbonate, hydroxyethyl cellulose sodium, and polyacrylamide into a grinder for grinding, and add potassium hydroxide after passing through 100 sieves, and then add it to a stirring tank for full stirring. The stirring rate was 600 rpm for 50 minutes to obtain the precipitant.

Embodiment 5

[0050] A precipitant for removing impurities in the chain solution of waste polyester products, the precipitant consists of the following components:

[0051] Nano calcium oxide 9 parts

[0052] 2 parts diatomaceous earth

[0053] Nano-alumina 8 parts

[0054] Potassium hydroxide 2 parts

[0055] Calcium carbonate 5 parts

[0056] Sodium hydroxyethyl cellulose 3 parts

[0057] 3 parts polyacrylamide;

[0058] Add nano-calcium oxide, diatomaceous earth, nano-alumina, calcium carbonate, hydroxyethyl cellulose sodium, and polyacrylamide into a grinder for grinding, and add potassium hydroxide after passing through 100 sieves, and then add it to a stirring tank for full stirring. The stirring rate was 600 rpm for 50 minutes to obtain the precipitant.

Embodiment 3

[0060] FeO magnetic fluid was prepared by alcohol-water co-heating method, according to Fe 3+ and Fe 2+ Fe in molar ratio 1:1 ratio 2 (SO 4 ) 3 solution and FeSO 4 Mix the solution evenly, heat to 65°C to keep constant temperature, add NaOH solution dropwise and stir well to make the mixture uniform, adjust the pH value to about 11, continue stirring and add absolute ethanol, stand still for 20-30 minutes, adjust the pH value, and continue to increase the temperature , stir quickly and add 0.5 times Fe 2+ Wrap it with a certain amount of surfactant sodium oleate, and then you can see the formation of black magnetic particles.

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Abstract

The invention belongs to the technical field of waste polyester regeneration, and particularly relates to a method for preparing colored polyester in a chain decomposing mode through waste polyester.The method for preparing colored polyester in the chain decomposing mode through waste polyester includes the following steps that (1) the recovered waste polyester is subjected to pre-processing andmatching color matching; (2) a chain decomposing reaction is carried out under the action of a chain decomposing catalyst, so a chain decomposing process is that the temperature of a mother liquor is190-210 DEG C, the reaction time is 30minutes-5 hours, a chain decomposing solution is subjected to precipitation, impurity removal and multi-stage filtration treatment, the filtration fineness is sequentially improved, the fineness of the primary filtration is 50-100 mesh, and finally the filtration fineness is 500-800 mesh; and (3) a chain-decomposed matter after impurity removal is sent to a polycondensation kettle for pre-polycondensation through complementary color, and finally a finished product is formed through final polycondensation. The method can prepare continuous, stable and high-quality colored recycled polyester, and high-value recycling of the waste polyester is realized. The method can prepare continuous, stable and high-quality colored recycled polyester, and realize high-value recycling of waste polyester.

Description

technical field [0001] The invention belongs to the technical field of waste polyester regeneration, and in particular relates to a method for preparing colored polyester by chain decomposition of waste polyester. Background technique [0002] Polyethylene terephthalate (PET) is a saturated polyester polymerized from terephthalic acid or dimethyl terephthalate and ethylene glycol. Due to its good physical and chemical stability and stretchability, it is widely used in clothing, food packaging and other fields. However, due to the strong chemical inertness of PET under natural conditions, it is difficult to be biodegraded, and a large amount of waste polyester causes serious pollution to the environment. Therefore, recycling waste polyester products can realize effective recycling of resources and reduce environmental pollution. Pollution has become an important issue in the polyester industry. [0003] At present, there are mainly physical and chemical methods for the recy...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C08G63/183C08G63/78C08J11/24C08J11/26C07C67/00C07C69/82D01F6/84C01G49/04H01F1/44B03C1/30B29B17/02
CPCB03C1/30B29B17/02B29B2017/0203B29B2017/0224B29B2017/0272C01G49/04C07C67/00C08G63/183C08G63/78C08J11/24C08J11/26D01F6/84H01F1/445C07C69/82Y02W30/52Y02W30/62
Inventor 钱军邢喜全王方河杜国强马哲峰
Owner 宁波大发新材料有限公司
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