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Coating-grade polyphenylene sulfide (PPS) resin and preparation method thereof

A polyphenylene sulfide resin and coating technology, which is applied in the production and synthesis process of polymer materials, can solve the problems of low toughness, high brittleness, and easy cracking of the coating, and achieve the effect of increasing toughness and bonding strength and improving brittleness

Inactive Publication Date: 2015-08-26
GUANGZHOU GAOBAER PLASTIC
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

The biggest disadvantage of linear PPS resin is that it is too rigid, too brittle, and has low toughness, so the coating is easy to crack and the adhesion to metal is relatively poor.

Method used

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  • Coating-grade polyphenylene sulfide (PPS) resin and preparation method thereof
  • Coating-grade polyphenylene sulfide (PPS) resin and preparation method thereof

Examples

Experimental program
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Embodiment 1

[0014] In a 100-liter reaction kettle, add 19 kg of sodium sulfide, 0.5 kg of sodium hydroxide (alkali metal salt), and 30 kg of NMP solvent, heat up to 150-200° C. after mixing, and dehydrate for 1-3 hours to obtain a mixture. Then, add 25 kilograms of NMP solvents, 0.2 kilograms of trichlorobenzene (crosslinking agent), 0.2 kilograms of lithium chloride and the mixture (catalyst) of sodium carbonate, 17.5 kilograms of p-dichlorobenzenes in reactor again, reactor is heated up to 220~250°C, keep warm for 3 hours, and carry out polymerization reaction. Finally, the polymerized substance is subjected to processes such as precipitation and separation to remove the NMP solvent to obtain a coating-grade polyphenylene sulfide resin.

[0015] It is determined that the molecular weight of the coating-grade polyphenylene sulfide resin is 23400, the melt index is 769, and the crystallinity is 50%.

[0016] It is measured by an electron microscope that about 10-20% of the linear molecul...

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Abstract

The invention discloses coating-grade polyphenylene sulfide (PPS) resin which is mainly prepared by enabling sodium sulfide, alkali metal salts, a crosslinking agent, a catalyst and paradichlorobenzene to react for 3-6 hours at 200-260 DEG C, wherein the crosslinking agent is trichlorobenzene or tribromobenzene. The invention further provides a preparation method of the coating-grade PPS resin. The preparation method comprises the following steps: (1) stirring and dispersing sodium sulfide and the alkali metal salts in a solvent NMP (N-methyl pyrrolidone), and dehydrating, thereby obtaining a mixture; (2) adding the solvent NMP, the catalyst, the crosslinking agent and paradichlorobenzene into the mixture, and heating to be 200-260 DEG C for polymerization reaction for 3-6 hours, thereby obtaining the coating-grade PPS resin. When the coating-grade PPS resin is synthesized, as a proper amount of the crosslinking agent is added, and the reaction temperature and the reaction time are controlled, the requested flowability of a coating can be met, the rigidity of PPS resin can be alleviated, the toughness and the adhesion strength can be improved, and thus the coating-grade PPS resin is applicable to insulation or anti-corrosion coatings on inner and outer surfaces of metals.

Description

technical field [0001] The invention relates to a production and synthesis process of polymer materials, in particular to a coating-grade polyphenylene sulfide resin synthesized by adding a crosslinking agent and a preparation method thereof. Background technique [0002] Polyphenylene sulfide (English: Polyphenylene sulfide; abbreviation: PPS) is a high-performance thermoplastic resin with excellent heat resistance, thermal stability, excellent corrosion resistance and chemical resistance, and also has a very low Dielectric constant, excellent insulation in high temperature and high humidity environment. Therefore, polyphenylene sulfide, as an emerging engineering plastic, has been widely used in electronics, aerospace, automobiles, home appliances, machinery and other fields. [0003] Polyphenylene sulfide coating (English: Polyphenylene sulfide Coating) makes full use of the excellent anti-corrosion and heat-resistant properties of polyphenylene sulfide, and is widely us...

Claims

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Application Information

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IPC IPC(8): C08G75/02C09D181/02
Inventor 周家鋆梁波周靖李淑仪
Owner GUANGZHOU GAOBAER PLASTIC
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