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Preparation method and process of modified polyphenylene sulfide fiber

Preparation method and process of modified polyphenylene sulfide fiber

  • Categories:Industry News
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  • Time of issue:2020-10-22 17:26
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(Summary description)Polyphenylene sulfide(pps)fiber is a special fiber,which has excellent chemical resistance,high temperature resistance,good flame retardancy,insulation,etc.

Preparation method and process of modified polyphenylene sulfide fiber

(Summary description)Polyphenylene sulfide(pps)fiber is a special fiber,which has excellent chemical resistance,high temperature resistance,good flame retardancy,insulation,etc.

  • Categories:Industry News
  • Author:
  • Origin:
  • Time of issue:2020-10-22 17:26
  • Views:
Information
  Background technique:
  Polyphenylene sulfide(pps)fiber is a special fiber,which has excellent chemical resistance,high temperature resistance,good flame retardancy,insulation,etc.,and is widely used in high temperature power plants,steel plants,cement plants,etc.Flue gas filtration.
  At present,the polyphenylene sulfide fiber multi-dimensional short fiber has been produced and used.With the increase of people’s attention to the environment,it has become a trend to improve the filtration efficiency of high-temperature flue gas filter materials.Therefore,a high Materials with high performance and high filtration efficiency are of great significance.Among them,nanofibers can effectively meet the needs of high-efficiency filtration due to their thin fibers,high specific surface area,and large aspect ratio.In order to make specific high-performance nano-polyphenylene sulfide fibers,in the prior art,many Use blending technology to prepare polyphenylene sulfide fiber;
  Taking ultrafine fiber pa6 as an example,blending with polyphenylene sulfide can effectively improve the preparation speed and performance of polyphenylene sulfide fiber;however,the conditions for its blending preparation are more stringent,such as pa6 at a condition higher than 290℃Under the conditions of degradation,pps has the problem of poor fluidity under the condition of less than 290℃.Therefore,when preparing pa6 and pps blending,the preparation temperature must be strictly controlled at 290℃,which greatly improves the polystyrene The preparation of sulfide fiber is difficult.
  In view of this,it is necessary to provide a method that can simply prepare PA6 and pps blended modified fibers.
  Technology realization factors:
  The object of the present invention is to provide a method for preparing modified polyphenylene sulfide fibers,so as to effectively realize the preparation of high-performance polyphenylene sulfide fibers,meet the requirements of high-efficiency filtration,and achieve the effect of reducing the difficulty of preparation.
  In order to achieve the above object,the present invention provides the following technical solution:a method for preparing modified polyphenylene sulfide fiber,which specifically includes the following steps:
  S1.Mix antioxidant,modifier and polyphenylene sulfide resin in a ratio of 1:3-10:40-90 to obtain a modified mixture;
  S2.Put the modified mixture,pa6 and reinforcing fiber in the extruder,melt and mix,and extrude to obtain the nascent fiber;
  S3.Multi-stage drafting and heat setting of the nascent fiber are carried out to obtain the finished modified polyphenylene sulfide fiber.
  Preferably,the polyphenylene sulfide resin adopts a linear polyphenylene sulfide resin or a branched polyphenylene sulfide resin,and the components of the polyphenylene sulfide resin include:a volatile content of 0 to 0.2%,and an ash content of 0.3~0.5%.
  Preferably,the modifier is a blend of polyethylene and ethylene-methyl acrylate-glycidyl methacrylate random terpolymer.
  Preferably,the mass ratio of the polyethylene to the ethylene-methyl acrylate-glycidyl methacrylate random terpolymer is 7-9:1-3.
  Preferably,the mixing mass ratio between the modified mixture,pa6 and the reinforcing fiber is 2-8:2-7:0-2.
  Preferably,the reinforcing fiber adopts one or more of glass fiber,carbon fiber,and ceramic fiber.Further,the reinforcing fibers are long fibers.
  Preferably,the extrusion temperature in the step s2 is 60-150°C.
  Preferably,the multi-stage drafting includes at least two drafts,and the temperature of one draft is 70°C to 100°C,and the temperature of two drafts is 115°C to 130°C.
  Preferably,the heat setting temperature is 110°C to 200°C.
  Compared with the prior art,the present invention has the following beneficial effects:
  A specific ratio of modifier is mixed into the polyphenylene sulfide resin to modify the polyphenylene sulfide resin so that the polyphenylene sulfide resin can also have good fluidity under low temperature conditions,thereby reducing the polyphenylene sulfide resin The mixing conditions of sulfide resin and pa6 can reduce the difficulty of preparing high-performance modified polyphenylene sulfide fiber.
  In addition,the modified polyphenylene sulfide fiber made by the present invention is also mixed with antioxidants and reinforcing fibers,which effectively improves the oxidation resistance and structural strength of the modified polyphenylene sulfide fiber,making it have long service life and fiber The advantages of high strength,good fracture resistance and good filtering effect.
  Detailed ways
  The technical solutions in the embodiments of the present invention will be clearly and completely described below.Obviously,the described embodiments are only a part of the embodiments of the present invention,rather than all the embodiments.Based on the embodiments of the present invention,all other embodiments obtained by those of ordinary skill in the art without creative work shall fall within the protection scope of the present invention.
  Example 1
  Antioxidant:md1024;
  Modifier:a blend of polyethylene and ethylene-methyl acrylate-glycidyl methacrylate random terpolymer with a mass mixing ratio of 9:1;
  polyphenylene sulfide resin:self-linear polyphenylene sulfide resin,including volatile content of 0.2%and ash content of 0.3%;
  and antioxidant:modifier:polyphenylene sulfide resin is 1:3:80;
  Reinforcing fiber:glass fiber ecs11-03-540;
  S1.Mix the antioxidant,modifier and polyphenylene sulfide resin in the above ratio to obtain a modified mixture;
  s2.Put the modified mixture,pa6 and reinforcing fiber in the extruder,melt and mix,and extrude to obtain the nascent fiber,and the modified mixture in this step:pa6:reinforcing fiber 7:2:1,extrusion temperature 150℃;
  s3.Perform multi-stage drafting and heat setting on the nascent fiber to obtain the finished modified polyphenylene sulfide fiber;and in this step,two drafts are used,the temperature of one draft is 90℃,and the second draft The temperature is 130°C;the heat setting temperature is 180°C.
  In this embodiment,the obtained modified polyphenylene sulfide resin mixture has good fluidity at 80°C or higher,and the final modified polyphenylene sulfide fiber finished product has a linear density of 1.89 dtex and a breaking strength of 4.15 cn/dtex.
  Example 2
  Antioxidant:md1024;
  Modifier:a blend of polyethylene and ethylene-methyl acrylate-glycidyl methacrylate random terpolymer with a mass mixing ratio of 8:2;
  polyphenylene sulfide resin:self-linear polyphenylene sulfide resin,including volatile content of 0.1%and ash content of 0.4%;
  and antioxidant:modifier:polyphenylene sulfide resin is 1:7:60;
  Reinforcing fiber:glass fiber ecs11-03-540;
  S1.Mix the antioxidant,modifier and polyphenylene sulfide resin in the above ratio to obtain a modified mixture;
  s2.Put the modified mixture,pa6 and reinforcing fiber in the extruder,melt and mix,and extrude to obtain the nascent fiber,and the modified mixture in this step:pa6:reinforcing fiber is 8:1:1,and the extrusion temperature Is 130°C;
  s3.Perform multi-stage drafting and heat setting on the nascent fiber to obtain the finished modified polyphenylene sulfide fiber;and in this step,two drafts are used,the temperature of one draft is 70℃,and the second draft is The temperature is 120°C;the heat setting temperature is 150°C.
  In this embodiment,the obtained modified polyphenylene sulfide resin mixture has good fluidity at a temperature above 70°C,and the final modified polyphenylene sulfide fiber finished product has a linear density of 2.2dtex and a breaking strength of 4.35cn/dtex.
  Example 3
  Antioxidant:md1024;
  Modifier:a blend of polyethylene and ethylene-methyl acrylate-glycidyl methacrylate random terpolymer with a mass mixing ratio of 7:3;
  Polyphenylene sulfide resin:self-linear polyphenylene sulfide resin,including volatile content of 0.1%and ash content of 0.5%;
  and antioxidant:modifier:polyphenylene sulfide resin is 1:5:90;
  Reinforcing fiber:glass fiber ecs11-03-540;
  S1.Mix the antioxidant,modifier and polyphenylene sulfide resin in the above ratio to obtain a modified mixture;
  s2.Put the modified mixture,pa6 and reinforcing fiber in the extruder,melt and mix,and extrude to obtain the nascent fiber,and the modified mixture in this step:pa6:reinforcing fiber is 8:1:0,extrusion temperature Is 100°C;
  s3.Perform multi-stage drafting and heat setting on the nascent fiber to obtain the finished modified polyphenylene sulfide fiber;and in this step,two drafts are used,the temperature of one draft is 60℃,and the second draft The temperature is 115°C;the heat setting temperature is 120°C.
  In this example,the obtained modified mixture of polyphenylene sulfide resin has good fluidity at a temperature above 50°C,and the final finished modified polyphenylene sulfide fiber has a linear density of 2.16 dtex and a breaking strength of 4.65 cn/dtex.
  Although the embodiments of the present invention have been shown and described,those of ordinary skill in the art can understand that various changes,modifications,and substitutions can be made to these embodiments without departing from the principle and spirit of the present invention.And variations,the scope of the present invention is defined by the appended claims and their equivalents.
 
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