A kind of preparation method and product of high crystallinity polyphenylene sulfide film

A technology of polyphenylene sulfide film and high crystallinity, which is applied in the field of preparation of polyphenylene sulfide film, can solve the problem of low crystallinity of polyphenylene sulfide film, which cannot meet the requirements of high long-term use temperature and dimensional stability, etc. problem, achieve the effect of reducing linear thermal expansion coefficient and thermal shrinkage rate, and improving crystallinity

Active Publication Date: 2022-06-21
ZHEJIANG NHU SPECIAL MATERIALS +1
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

However, the crystallinity of the polyphenylene sulfide film prepared by the prior art is often low, which cannot meet the requirements for high long-term use temperature and dimensional stability in practical applications.

Method used

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  • A kind of preparation method and product of high crystallinity polyphenylene sulfide film

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0075] The preparation of the low crystallinity sheet and the subsequent biaxial stretching process are exactly the same as in Comparative Example 3;

[0076] Then, perform two heat-setting-relaxation treatments, the first heat-setting temperature is 250°C, the heat-setting and relaxation time is 17s in total, and 4.0% thermal relaxation is completed on the film in the 9th to 17th seconds to reduce the thermal shrinkage of the film. . The second heat setting temperature is 262°C, the temperature difference from the first heat setting temperature is 12°C, the heat setting and relaxation time is 15s in total, and 2.1% thermal relaxation is completed on the film in the second to 15 seconds to reduce the film's thermal stability. heat shrink.

[0077] Finally, the film was cooled under cold air, the temperature of the cooling air was 30°C, and the cooling time was 10s.

[0078] After being conveyed by the traction device, the biaxially stretched film is trimmed, processed for th...

Embodiment 2

[0081] The production process is basically the same as that in Example 1, the only difference is that transverse stretching is performed during the first heat setting-relaxation treatment, and the transverse stretching is performed at the third to third times of the total time spent in the first heat setting-relaxation treatment. 5s is completed, and the stretching ratio is 1.02.

[0082] After testing, the biaxially oriented polyphenylene sulfide film prepared in this example has a crystallinity of 54.5% and a horizontal linear thermal expansion coefficient between 120 and 180° C. of 50×10 -6 .

Embodiment 3

[0084] The production process is basically the same as in Example 1, except that the temperature of the second heat setting is replaced from 262°C to 270°C, and the temperature difference from the temperature of the first heat setting is 20°C.

[0085] After testing, the biaxially oriented polyphenylene sulfide film prepared in this example has a crystallinity of 50.2% and a horizontal linear thermal expansion coefficient between 120 and 180° C. of 64×10 -6 .

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Abstract

The invention discloses a method for preparing a polyphenylene sulfide film with high crystallinity. The polyphenylene sulfide sheet is sequentially subjected to biaxial stretching treatment, heat setting-relaxation treatment and cooling treatment, and the heat setting-relaxation treatment is two steps. The second time, the temperature of the first heat-setting-relaxation treatment is 240-255°C, the temperature of the second heat-setting-relaxation treatment is higher than the temperature of the first heat-setting-relaxation treatment, and the temperature difference is 5-20°C; Low-ratio transverse stretching or longitudinal stretching is carried out during the first heat setting-relaxation treatment; the ratio of transverse stretching or longitudinal stretching is 1.02-1.05. The invention discloses a method for preparing a polyphenylene sulfide film with high crystallinity. By optimizing the preparation process and parameters, the crystallinity is higher than 50%, and it has higher long-term use temperature and higher dimensional stability. Non-toxic polyphenylene sulfide film, especially suitable for applications in flexible printed circuit boards (FPC).

Description

technical field [0001] The invention relates to the field of preparation of polyphenylene sulfide films, in particular to a method for preparing polyphenylene sulfide films with high crystallinity and products thereof. Background technique [0002] The molecular chain of polyphenylene sulfide is composed of benzene rings connected alternately by para-position sulfur atoms. The molecular structure contains rigid and heat-resistant phenylene and flexible heat-resistant sulfide bonds, and the rigid structure of The thioether bonds are connected, so the film has better heat resistance and thermal stability than conventional PET films, and is used as a high-performance special film. It has excellent strength, rigidity and fatigue resistance at high temperature, can be used continuously at 200-240°C, relatively stable in air or nitrogen below 400°C, and basically has no weight loss. Chemical corrosion resistance is similar to polytetrafluoroethylene (PTFE), which is known as the ...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): B29C55/12B29C35/02B29C35/16C08J7/00C08L81/02
CPCB29C55/12B29C35/02B29C35/16C08J7/08C08J2381/02B29C2035/1666
Inventor 周贵阳沈金涛邓杭军
Owner ZHEJIANG NHU SPECIAL MATERIALS
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