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Manufacturing method for high strength polyphenylene sulfide tube

A technology of polyphenylene sulfide and a manufacturing method, which is applied to tubular articles, applications, household appliances, etc., can solve the problem of reducing the bending impact strength and tensile strength of polyphenylene sulfide composite pipes, affecting mechanical properties, and having unsatisfactory effects. And other issues

Active Publication Date: 2009-10-21
德阳科吉高新材料有限责任公司
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, the effect of using pure polyphenylene sulfide resin is not ideal, because the polyphenylene sulfide resin pipe produced at this process level is relatively brittle due to high crystallinity, which directly affects the mechanical properties
[0004] In Chinese patent NO: 200710027360.0, a manufacturing method of adding polyamide compound, inorganic filler, and polyphenylene sulfide (PPS) composite material insert pipe is introduced, the purpose of which is to use composite material to extrude into a plastic pipe insert, Thereby providing a polyphenylene sulfide composite pipe with good processing performance and high mechanical strength, although it is easy to extrude after adding polyamide compound and other filler materials, but it reduces the polyphenylene sulfide composite pipe. Bending impact strength and tensile strength, there are certain defects in chemical corrosion resistance when used in chemical and petrochemical fields

Method used

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  • Manufacturing method for high strength polyphenylene sulfide tube

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0018] Pretreatment of polyphenylene sulfide resin:

[0019] (1) The pretreatment of polyphenylene sulfide resin is carried out in a high-pressure reactor: the polyphenylene sulfide resin is added to a mixed solution of N-methylpyrrolidone and dimethylacetamide containing 30% water with a concentration of 30% wt, and added 0.5%wt of sodium borohydride, heating at 230°C, holding time for 3h, cooling to 150°C and filtering while hot, finally washing with deionized water repeatedly, filtering for 6 times, vacuum drying at 100°C to obtain the treated polyphenylene As for the sulfide resin, the melt index of the polyphenylene sulfide resin is 80g / 10min after testing, the molecular weight distribution coefficient of the resin reaches 1.91 and the weight average molecular weight reaches 75,000. Polyphenylene sulfide resin pipe manufacturing formula: polyphenylene sulfide resin is 99.5% polyoxyethylene ether triphenyl phosphite is 0.5%. The obtained polyphenylene sulfide resin is mix...

Embodiment 2

[0022] Pretreatment of polyphenylene sulfide resin:

[0023] Add polyphenylene sulfide resin at a concentration of 30%wt to a mixed solution of N-methylpyrrolidone and dimethylacetamide containing 30% water, and add 0.5%wt sodium borohydride, heat at 260°C, and hold for 0.5 , cooled to 150°C and filtered while hot to obtain a polyphenylene sulfide resin with a molecular weight distribution coefficient of 1.91-1.93 and a weight-average molecular weight of 70,000-80,000. Finally, it was repeatedly washed with deionized water, filtered 8 times, and vacuum-dried at 100°C. , to obtain a good polyphenylene sulfide resin after treatment, the melt index of polyphenylene sulfide is 63g / 10min after detection. Resin molecular weight distribution coefficient to 1.93 and weight average molecular weight to 77,000

[0024] The obtained polyphenylene sulfide resin was oxidized and thermally crosslinked at 210° C. for 4 hours, and then 0.5% of a heat stabilizer fatty alcohol polyoxyethylene e...

Embodiment 3

[0026] The polyphenylene sulfide resin obtained by the pretreatment is the same as that in Example 2. The obtained polyphenylene sulfide resin was oxidized and thermally crosslinked at 240°C for 2 hours, then added 1.5% of heat stabilizer, 8% of TPE micropowder, and 20% of inorganic filler, and then continued to draw the tube, adding 20% Material amount of glass fiber. The polyphenylene sulfide resin is mixed and extruded by a twin-screw extruder and introduced into a single-screw extruder, extruded from a tubular die at the head of the extruder, and drawn into a tube to form a polyphenylene sulfide resin pipe; using the process of Example 1 The performance index of the polyphenylene sulfide resin pipe manufactured by the control index is: latitude and weft strength is 82.5Mpa, radial strength is 102.1Mpa, density is 1.37g / cm 3 .

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Abstract

The invention discloses a manufacturing method for a high strength polyphenylene sulfide tube. The manufacturing method comprises the following steps: carrying out pretreatment on polyphenylene sulfide resin in a high pressure autoclave, namely adding 30 weight percent polyphenylene sulfide resin into a mixed liquor of N-methylpyrrolidone and dimethyl acetamide with 30 percent water content, adding 0.5 weight percent sodium borohydride, increasing the temperature to 230 to 260 DEG C, holding the temperature for 0.5 to 3 hours, cooling down to 150 DEG C, and carrying out the filtration when the solution is hot to obtain the polyphenylene sulfide resin with a molecular weight distribution factor of 1.91 to 1.93 and a weight average molecular weight of 70 to 80 thousand; milling and extruding the obtained polyphenylene sulfide resin through a twin screw extruder, leading the extruded polyphenylene sulfide resin into a single screw extruder, controlling the linear velocity of material extrusion flow at 300 mm / min, controlling a tube cooling zone at 2,000 mm, and controlling the temperature of the inlet of the cooling zone at 260 DEG C and the temperature of the outlet of the cooling zone at 90 DEG C; and extruding the material by a tubular die on a head of the single screw extruder for tube drawing and formation to prepare the polyphenylene sulfide tube. The tube prepared by the method has the advantages of few microcosmic pores and surface microcracks, high chemical corrosion resistance and mechanical strength, and high tube yield.

Description

Technical field [0001] The invention belongs to the application field of special polymer materials Background technique [0002] Polyphenylene sulfide (PPS) has excellent thermal stability, excellent high temperature resistance, corrosion resistance, and a melting point of 285°C. PPS composite materials have excellent processing properties for injection molding and extrusion molding, and can be processed into various specifications and various Shaped PPS profiles or composite products are used in more demanding fields. It is still the goal that people pursue to explore, discover, and apply PPS resins and PPS composite materials with better performance. [0003] In U.S. Patent NO: 5151235, a method for manufacturing polyphenylene sulfide pipes made of phenylene sulfide and diphenyl sulfide copolymer resin is introduced, the purpose of which is to improve the resistance of polyphenylene sulfide copolymer resin during extrusion molding. Thermal stability and toughness and surf...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): B29C47/00B29C47/92C08L81/02C08K13/02C08K7/14B29L23/00B29C48/92
CPCB29C48/397B29C48/92B29C2948/92704B29C2948/9258B29C2948/92923B29C2948/92942
Inventor 陈逊
Owner 德阳科吉高新材料有限责任公司