Method for preparing polyphenylene sulfide resin and polyphenylene sulfide resin prepared by using method

A technology of polyphenylene sulfide resin and polyphenylene sulfide, applied in the direction of adhesives, etc., can solve the problems of restricting the use of impact-resistant parts, low elongation, high melting point, etc., achieve high melting crystallization temperature, short production cycle, and wide application range Effect

Active Publication Date: 2018-06-15
ZHEJIANG NHU CO LTD +2
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0004] (1) High brittleness and low elongation
It can be known from the chemical structure of polyphenylene sulfide that its molecular chain is rigid, and its maximum crystallinity can reach 70%, so its toughness is poor, and its welding strength is not good, which limits its use as an impact-resistant component
[0005] (2) High cost
[0006] (3) Paintability and colorability are not ideal
Since polyphenylene sulfide has excellent chemical resistance, its paintability and colorability are relatively poor
[0007] (4) High melting point
Since its linear molecular structure is destroyed, it can only be used as a modifying additive

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment approach 1

[0055] In an embodiment, the present invention provides a preparation method of polyphenylene sulfide resin. Under alkaline conditions, the primary product of polyphenylene sulfide is used as a raw material, and a hydroxyl-containing aromatic thiol compound and 4-phenylthio-benzene The mercaptan is used as the end group regulator to carry out the terminal group regulation reaction, and the polyphenylene sulfide resin is prepared.

[0056] terminal regulator

[0057] In an embodiment of the present invention, a hydroxyl-containing aromatic thiol compound and 4-phenylthio-benzenethiol are used as the terminal regulator of polyphenylene sulfide, and react with the primary product of polyphenylene sulfide resin to form - R-OH and phenyl terminated molecular end group structure. Among them, -R-OH end group can improve the reactivity of polyphenylene sulfide resin; phenyl can improve the melting and crystallization temperature of polyphenylene sulfide resin; The effect of the ch...

Embodiment approach 2

[0069] The invention provides a polyphenylene sulfide resin, which has a thermal stability index of 0.95 or more, a reactivity of 2.5 or more, and a melting and crystallization temperature of 230-260°C. Preferably, the polyphenylene sulfide resin has a thermal stability index of 0.96 or higher.

[0070] thermal stability

[0071] The thermal stability described in the present invention is characterized by thermal stability index.

[0072] In polyphenylene sulfide resin, the nitrogen content of the terminal group has an important influence on the thermal stability of the resin. The nitrogen content of the terminal group is brought about by the side reaction of the reaction solvent in the polycondensation reaction to prepare the primary product of polyphenylene sulfide. In the polycondensation reaction, using fatty acids as polycondensation aids, especially C5-C6 fatty acids as polycondensation aids, can effectively reduce the nitrogen content of terminal groups, and can sig...

specific Embodiment

[0088] The present invention is described more specifically with examples below, but the present invention is not limited to these examples.

[0089] The assay method of physical property and related characteristic among the present invention is as follows:

[0090] (1) Determination method of melt viscosity

[0091] The present invention is to measure the melt viscosity of polyphenylene sulfide by the LCR7001 capillary rheometer that Dynisco Company makes. During the test, first introduce the polymer sample into the device, set the temperature at 310°C, keep it for 5 minutes, and then -1 Measure the melt viscosity.

[0092] (2) Determination method of thermal stability

[0093] After keeping the polymer sample at 310°C for 5min, at a shear rate of 1216sec -1 The measured melt viscosity is denoted as MV 1 ; For the same polymer sample, after 30min at 310°C, at a shear rate of 1216sec -1 The measured melt viscosity is denoted as MV 2 ;MV 2 / MV 1 That is thermal stabili...

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Abstract

The invention discloses a method for preparing polyphenylene sulfide resin and the polyphenylene sulfide resin prepared by using the method. The method comprises the steps of: performing a polycondensation reaction by adopting a sulfur-containing compound, an alkaline substance and p-dichlorobenzene as raw materials and fatty acid as a polycondensation assistant, conducting purification treatmentto obtain a primary product of the polyphenylene sulfide resin, and then performing a reaction between the primary product of the polyphenylene sulfide resin and terminal-group modifier at a high temperature to generate the polyphenylene sulfide resin. The preparation method has high yield and low cost, and the prepared polyphenylene sulfide resin has high reaction activity, high melting and crystallization temperatures and excellent heat resistance at the same time; the polyphenylene sulfide resin can be directly applied to extrusion and injection molding, and is particularly applicable to the fields of automobile parts, electronic/electrical equipment, chemical engineering, machinery industry and the like.

Description

technical field [0001] The invention belongs to the field of polymer materials, and relates to a polyphenylene sulfide resin with high reactivity, high melting crystallization temperature and high thermal stability, and also relates to a preparation method and application of the polyphenylene sulfide resin. Background technique [0002] Polyphenylene Sulfide (PPS) is an engineering plastic with excellent heat resistance, chemical resistance, flame retardancy, mechanical strength, electrical properties, and dimensional stability. Since PPS can be formed into various molded products, films, sheets, fibers, etc. by general melt processing methods such as extrusion molding, injection molding, and compression molding, it is widely used in the fields of electronic and electrical equipment, automotive equipment, etc. [0003] The unmodified polyphenylene sulfide has medium strength, and after enhanced modification, it has excellent strength and rigidity, and becomes an engineering ...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C08G75/029C08G75/0254C08L81/02
CPCC08G75/0254C08G75/029C08L81/02C08G75/0213C09J181/00C08G75/0259C08G75/0209C08G75/0281
Inventor 李沃源尹红陈志荣胡柏剡周贵阳邓杭军连明张雄伟李其川赵江
Owner ZHEJIANG NHU CO LTD
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