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Preparation method of low-cost polyphenylene sulfide

A polyphenylene sulfide, low-cost technology, applied in the field of low-cost polyphenylene sulfide preparation, can solve the problems of low molecular weight of PPS, poor batch stability, harsh synthesis conditions, etc., achieve no competitive advantage, improve Degree of polymerization and various mechanical properties, reproducible effects

Active Publication Date: 2017-05-31
四川中科兴业高新材料有限公司
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

[0017] The invention provides a preparation method of low-cost polyphenylene sulfide, which avoids the use of lithium chloride and reduces the production cost, so as to solve the problems of low molecular weight, poor batch stability, harsh synthesis conditions, and poor equipment quality of PPS synthesized in the prior art. Complex, costly, and energy-intensive manufacturing issues

Method used

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  • Preparation method of low-cost polyphenylene sulfide

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0044] Before putting into production, analyze the purity of p-dichlorobenzene, sodium sulfide, N-methylpyrrolidone, sodium hydroxide, and catalyst to avoid affecting the later production.

[0045] Taking the input amount of 100Kg p-dichlorobenzene as an example, proceed as follows:

[0046] (1) Sodium sulfide feeding:

[0047] Before charging, open the exhaust valve of the dehydration kettle leading to the tail gas treatment device to release the pressure in the dehydration kettle.

[0048] In the warehouse, transfer the 52Kg whole package of flaky industrial pure sodium sulfide to the dehydration reaction workshop by trolley, lift it to the floor where the unpacking room is located, and transport it to the airtight and ventilated unpacking room, unpack the sodium sulfide and put it into the feeding hopper In, add 2.5kg sodium hydroxide at the same time, sodium sulfide and sodium hydroxide are unloaded in the dehydration still by feeding hopper;

[0049] N-methylpyrrolidone...

Embodiment 2

[0074] According to the operation steps described in Example 1, repeat 3 times, the average molecular weights of the polyphenylene sulfide obtained 3 times are: 25880, 25650, 25850, the molecular weight is high and relatively stable, indicating that the method has good stability and reproducibility High stability, completely solved the problem of unstable products and low molecular weight of traditional craft products; the quality of the final polyphenylene sulfide were: 60.3Kg, 61.2Kg, 60.4Kg, the theoretical output was 72.070Kg, repeated operations 3 times The lowest yield reaches 83.67%, and the conversion rate is high.

[0075] The physical properties of the polyphenylene sulfide obtained by repeating the operation three times are shown in Table 1:

[0076] Table 1 Physical properties of polyphenylene sulfide

[0077]

[0078] It can be seen from Table 1 that the polyphenylene sulfide prepared by the method of the present invention has excellent mechanical properties a...

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Abstract

The invention discloses a preparation method of low-cost polyphenylene sulfide, and relates to the field of macromolecular materials. The preparation method is characterized by using sodium sulfide and paradichlorobenzene as raw materials, using sodium benzoate and caprolactone as catalysts, using N-methyl pyrrolidone as a solvent, and using sodium hydroxide as an additive, and a specific technological process in production sequentially comprises the following steps: feeding the sodium sulfide, feeding the paradichlorobenzene, dissolving the catalysts, pre-polymerizing, polymerizing again, filtering, washing, drying, and packaging, so as to obtain a polyphenylene sulfide product. The preparation method has the advantages that a lithium chloride catalyst in the existing domestic main technology is not used, and the low-cost sodium benzoate and caprolactone are used as the catalysts, so that the production cost is reduced; all raw materials are dripped by several times at normal temperature, so that the polymerization reaction is performed within a certain temperature range, so as to effectively prevent heat releasing implosion during the polymerization reaction, improve the polymerization degree and various mechanical properties of the polyphenylene sulfide, and thoroughly solve the problems of instability, low molecular weight and poor property in the traditional technology product.

Description

technical field [0001] The invention relates to the field of polymer materials, and more specifically relates to a preparation method of low-cost polyphenylene sulfide. Background technique [0002] Polyphenylene sulfide has excellent thermal stability, chemical stability, corrosion resistance and electrical properties, and has good affinity with various inorganic fillers. It can be compounded with various inorganic fillers and other polymer materials to make Various engineering plastics and blended alloys with excellent performance. In addition, polyphenylene sulfide (PPS) products have outstanding dimensional stability, and can be processed by almost all plastic processing methods, including spraying, injection molding, compression molding, extrusion, blowing and potting, etc., and the products can also be processed Secondary processing. Therefore, polyphenylene sulfide (PPS) has a wide range of applications in automobile manufacturing, electrical and electronic, machine...

Claims

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Application Information

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IPC IPC(8): C08G75/0254C08G75/0209C08G75/0281
CPCC08G75/0209C08G75/0254C08G75/0281
Inventor 刘洪
Owner 四川中科兴业高新材料有限公司
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