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Preparation method of micro-alcoholysis functional regenerated polyamide 6

A polyamide and functional technology, which is applied in the field of preparation of micro-alcoholysis functional regenerated polyamide 6, can solve the problems of limited polymerization principle, difficult application and industrialization, etc., and achieves the effect of improving the conversion rate

Active Publication Date: 2021-07-23
DONGHUA UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, the preparation of the current copolymerization-modified functionalized polyamide 6 is limited by the polymerization principle, and it is difficult to apply it to the actual industrialization.

Method used

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  • Preparation method of micro-alcoholysis functional regenerated polyamide 6
  • Preparation method of micro-alcoholysis functional regenerated polyamide 6
  • Preparation method of micro-alcoholysis functional regenerated polyamide 6

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0051] A kind of preparation method of slightly alcoholysis functional regenerated polyamide 6, concrete steps are as follows:

[0052] Raw material preparation:

[0053] Waste polyamide 6: the relative viscosity of polyamide 6 in the waste polyamide 6 is 2, the melting point is 190°C, and the number average molecular weight is 12000g / mol;

[0054] Diol monomer: K-1 in Table 1;

[0055] Functional dibasic acid monomer: [(6-oxo-6H-dibenzo[c,e][1,2]oxaphosphorin-6-yl)methyl]succinic acid;

[0056] Catalyst: tetrabutyl titanate;

[0057] Heat stabilizer: triphenyl phosphite;

[0058] Anti-ether agent: sodium acetate;

[0059] (1) Add diol monomers to waste polyamide 6, and carry out alcoholysis reaction for 2 hours at a temperature of 230°C and a pressure of 2 MPa to produce a number-average molecular weight of 7000g / mol and diols at both ends. The alcoholysis polyamide 6 segment of the esterified product structure and the amino group is used as a product; wherein, the addit...

Embodiment 2

[0063] A kind of preparation method of slightly alcoholysis functional regenerated polyamide 6, concrete steps are as follows:

[0064] Raw material preparation:

[0065] Waste polyamide 6: the relative viscosity of polyamide 6 in the waste polyamide 6 is 2.5, the melting point is 200°C, and the number average molecular weight is 14000g / mol;

[0066] Diol monomer: K-2 in Table 1;

[0067] Functional dibasic acid monomer: 2-carboxyethylphenylphosphinic acid;

[0068] Catalyst: tetrabutyl titanate;

[0069] Heat stabilizer: triphenyl phosphite;

[0070] Anti-ether agent: sodium acetate;

[0071] (1) Add diol monomers to waste polyamide 6, and carry out alcoholysis reaction for 1.6 hours at a temperature of 235°C and a pressure of 1.8 MPa, resulting in a number-average molecular weight of 7500 g / mol and two Alcoholyzed polyamide 6 chain segment with polyalcohol esterification structure and amino group as a product; wherein, the addition amount of diol monomer is 7wt% of the ...

Embodiment 3

[0075] A kind of preparation method of slightly alcoholysis functional regenerated polyamide 6, concrete steps are as follows:

[0076] Raw material preparation:

[0077] Waste polyamide 6: the relative viscosity of polyamide 6 in the waste polyamide 6 is 3, the melting point is 210°C, and the number average molecular weight is 18000g / mol;

[0078] Diol monomer: K-3 in Table 1;

[0079] Functional dibasic acid monomer: 2-carboxyethylphenylphosphinic acid;

[0080] Catalyst: titanium glycolate;

[0081] Heat stabilizer: triphenyl phosphite;

[0082] Anti-ether agent: sodium acetate;

[0083] (1) Add diol monomers to waste polyamide 6, and carry out alcoholysis reaction at a temperature of 240°C and a pressure of 1.6 MPa for 1.4 hours to produce a number-average molecular weight of 8000 g / mol and two Alcoholyzed polyamide 6 chain segment with polyalcohol esterification structure and amino group as a product; wherein, the addition amount of diol monomer is 6wt% of the waste ...

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Abstract

The invention relates to a preparation method of micro-alcoholysis functional regenerated polyamide 6. The preparation method comprises the following steps: adding a dihydric alcohol monomer into waste polyamide 6, and carrying out micro-alcoholysis reaction to generate an alcoholysis polyamide 6 chain segment; adding a functional binary acid monomer, and sequentially carrying out esterification, amidation and ester-amide exchange reaction to prepare functional regenerated polyamide 6, wherein the micro-alcoholysis reaction refers to generation of an alcoholysis polyamide 6 chain segment of which the number-average molecular weight is 7000-9000 g / mol and two ends are respectively a dihydric alcohol ester structure and an amino group; the relative viscosity of the prepared functional regenerated polyamide 6 is 2.4-3.6, the melting point is 190-250 DEG C, the number-average molecular weight is 18000-30000 g / mol, the molecular weight distribution is 2-4, the initial thermal decomposition temperature is 430-490 DEG C, the breaking strength is 40-60 MPa, and the elongation at break is 30-90%. According to the method, waste polyamide 6 plastic products and fiber products can be recycled and regenerated through a simple process, functional products with higher commodity additional values are polymerized, the price burden of regenerated products is made up, and the regenerated products have better popularization space.

Description

technical field [0001] The invention belongs to the technical field of polymer copolymer preparation, and relates to a preparation method of slightly alcoholysis functional regenerated polyamide 6. Background technique [0002] Due to the excellent physical and mechanical properties and textile processing performance of polyamide 6 fiber, my country's polyamide production has exceeded 3 million tons in 2017, a year-on-year increase of nearly 10%. With the continuous increase in production capacity of polyamide 6, more and more solid waste is generated every year. Polyamide 6 is chemically stable and difficult to degrade in the natural environment. If it is not recycled, it will definitely have a great impact on the environment. At present, the resource recycling of polyamide 6 mainly relies on physical methods for regeneration and application, which cannot achieve a good closed-loop recycling. Chemical recycling has always been considered as an efficient, green and sustain...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C08G69/16C08G69/48
CPCC08G69/16C08G69/48
Inventor 张圣明吉鹏王朝生王华平吴宇豪余志文孟成真
Owner DONGHUA UNIV
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