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Preparation method of foamed polyester slurry

A polyester pulp and foaming technology, which is applied in the field of water-soluble polyester pulp preparation, can solve the problems of different purposes, consume a lot of steam, and take a long time for pulping, so as to increase the specific surface area and speed up the dissolution rate. Effect

Active Publication Date: 2015-11-18
湖北山特莱新材料有限公司
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

The foamed polyester in the prior art is as mentioned above, and the purposes are different from the purpose of this patent, and the implementation method is more complicated
[0004] As mentioned above, the disadvantages of polyester slurry in the prior art are very obvious: (1) The crushing process often damages the cutter; (2) The process of dissolving the pulp consumes a lot of steam, and the pulping time is longer

Method used

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  • Preparation method of foamed polyester slurry

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Experimental program
Comparison scheme
Effect test

Embodiment 1

[0022] The preparation method includes the following process steps:

[0023] (1) 750kg of waste recycled polyester plastic (with moisture content within 6%),

[0024] Ethylene glycol 280kg (over 200% excess),

[0025] Isophthalic acid 50kg,

[0026] 100kg of isophthalic acid-5-sodium sulfonate,

[0027] Sb 2 O 3 120g,

[0028] The above components are mixed and put into a 1.8 cubic cone-bottom jacketed kettle type polymerization kettle, and the temperature rises at a static normal pressure. In this process, the top temperature of the fractionation column of the reactor is controlled at 105 ° C ± 3 ° C in the initial stage. When the temperature reaches 235°C±5°C, the material is completely melted, and when the distilled water and / or methanol reaches 90-100% of the theoretical distillate, the internal temperature is raised to 250-260°C, and the excess ethylene glycol is distilled out;

[0029] (2) After the above pre-melting reaction is completed, the material is introduce...

Embodiment 2

[0035] The preparation method includes the following process steps:

[0036] (1) 750kg of waste recycled polyester plastic (with moisture content within 6%),

[0037] Ethylene glycol 300kg (over 240% excess),

[0038] Isophthalic acid 75kg,

[0039] 75kg of isophthalic acid-5-sodium sulfonate,

[0040] Sb 2 O 3 120g,

[0041] The above components are mixed and put into a 1.8 cubic cone-bottom jacketed kettle type polymerization kettle, and the temperature rises at a static normal pressure. In this process, the top temperature of the fractionation column of the reactor is controlled at 105 ° C ± 3 ° C in the initial stage. When the temperature reaches 235°C±5°C, the material is completely melted, and when the distilled water and / or methanol reaches 90-100% of the theoretical distillate, the internal temperature is raised to 250-260°C, and the excess ethylene glycol is distilled out;

[0042] (2) After the above pre-melting reaction is completed, the material is introduced...

Embodiment 3

[0048] The preparation method comprises the following process steps:

[0049] (1) 800kg of waste recycled polyester plastic (moisture content within 6%),

[0050] Ethylene glycol 300kg (more than 180% in excess),

[0051] Isophthalic acid 50kg,

[0052] Sodium isophthalic acid-5-sulfonate 125kg,

[0053] Sb 2 o 3 120g,

[0054] Mix the above components and put them together into a 1.8 cubic cone-bottomed jacketed kettle-type polymerization kettle, and raise the temperature under static normal pressure. During this process, the top temperature of the reaction kettle fractionation column is controlled at 105°C ± 3°C at the beginning stage. When the reaction internal temperature When the temperature reaches 235°C±5°C, the material is completely melted, and when the distilled water and / or methanol reaches 90-100% of the theoretical distilled amount, then raise the internal temperature to 250-260°C to distill out excess ethylene glycol;

[0055] (2) After the above pre-meltin...

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Abstract

The invention discloses a preparation method of foamed polyester slurry, and belongs to the technical field of water soluble polyester slurry. The invention aims to solve the problems that in the prior art, the cutter is damaged easily, and the slurry dissolution wastes too much energy and time. The preparation method is characterized by comprising the following steps: mixing recycled polyester, glycol, water soluble monomers, and a catalyst according to a certain ratio, then throwing the mixture into a pre-melting kettle to carry out pre-melting; then introducing the mixture to a final polymerization kettle, gradually increasing the vacuum degree in the kettle until the pressure in the kettle reaches an absolute pressure of 133 Pa or less; keeping on raising the temperature in the kettle, wherein the reactions are finished when the kettle temperature reaches 275 + / - 2 DEG C, and the stirring power is 10 KW or so; introducing high-purity nitrogen gas into the kettle to break the vacuum state until the pressure in the kettle reaches 0.1-0.2 MPa, keeping on stirring for 5 to 10 minutes, discharging polymer to a hopper; naturally cooling the polymer, and breaking the foamed blocks into powder by a powerful pulverizer. The provided preparation method has the advantages of the breaking difficulty is reduced, the dissolution speed is accelerated, and the energy and material consumption is reduced, and is mainly used to produce foamed polyester slurry.

Description

technical field [0001] The invention belongs to the technical field of preparation of water-soluble polyester pulp, and in particular relates to a preparation method of foamed polyester pulp. Background technique [0002] In the usual production process of polyester (PET) products, the excess ethylene glycol in the system is removed by vacuuming to increase the molecular weight and achieve the purpose of condensation polymerization. , It is also conducive to the subsequent melting of the product, which is convenient for compacting materials and producing qualified polyester products (including chemical fibers, sheets, films, etc.). The production of polyester pulp follows the usual polyester production process, and the product is dense, which is not conducive to dissolution. Moreover, in the crushing process, due to the dense product and high strength, it increases the difficulty of crushing and consumes A lot of energy. [0003] In the production and application process o...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C08J9/30C08G63/688C08L67/00
Inventor 韦金红陈春华孙经纶周重旭
Owner 湖北山特莱新材料有限公司
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