阅读说明：本技术 一种ptfe超细纤维的制备方法 (Preparation method of PTFE (polytetrafluoroethylene) superfine fiber ) 是由 王国芳 于 2020-08-11 设计创作，主要内容包括：本发明公开了一种PTFE超细纤维的制备方法,首先将PTFE分散树脂颗粒投入研磨机中磨粉,经筛粉后获得粒径均一的PTFE粉料；接着将PTFE粉料投入搅拌机,然后将质量百分比为2-5％的表面化学处理剂和4-8％耐磨填料投入搅拌机中进行搅拌,然后混合物置于烘箱中进行熟化和烘干；将获得的干燥混合物采用液压的形式压制成棒状,经挤条机中挤出成条状料；在辊筒式压膜机上压制片膜得到长纤维,再进行卷曲加工在切断机上进行切断,最后对短纤维进行热定型得到成品。本发明通过加入表面化学处理剂使其具备高耐酸性能,其耐酸性能远高于GF/PTFE纤维混纺纱,使用寿命也较普通PTFE纤维。(The invention discloses a preparation method of PTFE superfine fiber, which comprises the steps of firstly putting PTFE dispersion resin particles into a grinding machine for grinding, and obtaining PTFE powder with uniform particle size after powder screening; then putting PTFE powder into a stirrer, putting 2-5% of surface chemical treatment agent and 4-8% of wear-resistant filler in mass percent into the stirrer for stirring, and putting the mixture into an oven for curing and drying; pressing the obtained dry mixture into a rod shape in a hydraulic mode, and extruding the rod-shaped dry mixture into a strip material in a strip extruding machine; pressing the sheet film on a roller type film pressing machine to obtain long fibers, then performing crimping processing, cutting the long fibers on a cutting machine, and finally performing heat setting on short fibers to obtain a finished product. The chemical fiber blended yarn has high acid resistance by adding the surface chemical treatment agent, the acid resistance of the chemical fiber blended yarn is far higher than that of GF/PTFE fiber blended yarn, and the service life of the chemical fiber blended yarn is longer than that of common PTFE fiber.)

1. The preparation method of the PTFE superfine fiber is characterized by comprising the following steps:

step S01, putting PTFE dispersion resin particles into a grinding machine for grinding, and obtaining PTFE powder with uniform particle size after powder screening;

step S02, putting PTFE powder into a stirrer, and then putting 2-5% of surface chemical treatment agent and 4-8% of wear-resistant filler in mass percent into the stirrer for stirring for 20-40 min;

s03, placing the mixture obtained in the S02 in an oven for curing and drying;

s04, pressing the dry mixture obtained in the S04 into a rod shape in a hydraulic mode, and extruding the rod shape into a strip material in a strip extruding machine;

step S05, pressing the film on a roller type film pressing machine;

step S06, sintering by a sintering device, drafting and thinning by a drafting device, splitting and carding, and then obtaining continuous long fibers by two yarn splitting procedures;

step S07, curling the long fiber on a curling machine, and cutting the curled long fiber on a cutting machine;

step S08, heat setting short fiber on a setting machine;

and step S09, boxing the short fibers after heat setting and warehousing to obtain the finished product.

2. The method for preparing PTFE ultrafine fibers according to claim 1, wherein the surface chemical treatment agent in the step S02 comprises 15 to 45% by weight of PTFE emulsion, 5 to 8% by weight of hydroxy silicone oil, 1.2 to 2.5% by weight of silane coupling agent A151 and 5 to 12% by weight of ultrafine graphite.

3. The method for preparing PTFE superfine fiber according to claim 1, wherein the wear-resistant filler in the step S02 is one or more of silicon dioxide, molybdenum disulfide, silicon carbide, boron nitride, graphite, carbon fiber and alumina.

4. The method for preparing PTFE microfiber according to claim 1, wherein the drying temperature in step S03 is 20-50 ℃ and the drying time is 8-10 hours.

5. The method for preparing PTFE microfiber according to claim 1, wherein in step S05, the sheet film has a thickness of 0.05 to 0.07 mm and a width of 10 to 15 cm.

6. The method for preparing PTFE ultrafine fibers according to claim 1, wherein in the step S07, the operating temperature of the crimping machine is 200-250 ℃, and the linear velocity is 2-4 m/min.

7. The method for preparing PTFE ultrafine fiber according to claim 1, wherein in the step S06, the diameter of the short fiber is 6-9 um, and the yarn number is 100-150 TEX.

Technical Field

The invention relates to the field of agricultural machinery, in particular to a preparation method of PTFE (polytetrafluoroethylene) ultrafine fibers.

Background

Polytetrafluoroethylene, commonly known as "plastic king", is a high molecular compound formed by polymerizing tetrafluoroethylene, and has excellent chemical stability, corrosion resistance, sealing property, high lubrication non-adhesiveness, electrical insulation property and good ageing resistance. Used as engineering plastics and can be made into polytetrafluoroethylene tubes, rods, belts, plates, films and the like.

The PTFE short fiber prepared from the PTFE superfine fiber can be widely applied to the fields of waste incineration, power plant dust removal, cement dust removal, building materials and the like due to excellent stability and extremely low shrinkage rate, the cut PTFE short fiber can be made into a needled felt and the like, the post-treatment process report on the PTFE superfine fiber is less, and static electricity is easily generated by friction in the process of processing and producing the short fiber, so that the processing process is difficult, the problem that the processed PTFE short fiber is difficult to comb such as wool winding, caking, hair grains and the like is easily caused, the expansion coefficient of the PTFE material is higher, and the expansion coefficient can change along with the temperature, so the deviation of the PTFE short fiber in size and shrinkage rate can be caused, and the production quality is unstable. Therefore, there is a need in the art to provide a method for preparing PTFE superfine fiber, which is used to prepare PTFE short fiber finished product and has good acid resistance and wear resistance.

Disclosure of Invention

Aiming at the existing problems, the invention provides a preparation method of PTFE (polytetrafluoroethylene) superfine fiber, which is used for preparing PTFE short fiber finished products and has good acid resistance and wear resistance.

In order to solve the problems, the invention adopts the following technical scheme: a preparation method of PTFE superfine fiber comprises the following steps:

step S01, putting PTFE dispersion resin particles into a grinding machine for grinding, and obtaining PTFE powder with uniform particle size after powder screening;

step S02, putting PTFE powder into a stirrer, and then putting 2-5% of surface chemical treatment agent and 4-8% of wear-resistant filler in mass percent into the stirrer for stirring for 20-40 min;

s03, placing the mixture obtained in the S02 in an oven for curing and drying;

s04, pressing the dry mixture obtained in the S04 into a rod shape in a hydraulic mode, and extruding the rod shape into a strip material in a strip extruding machine;

step S05, pressing the film on a roller type film pressing machine;

step S06, sintering by a sintering device, drafting and thinning by a drafting device, splitting and carding, and then obtaining continuous long fibers by two yarn splitting procedures;

step S07, curling the long fiber on a curling machine, and cutting the curled long fiber on a cutting machine;

step S08, heat setting short fiber on a setting machine;

and step S09, boxing the short fibers after heat setting and warehousing to obtain the finished product.

Preferably, the surface chemical treatment agent in step S02 includes 15 to 45% by weight of PTFE emulsion, 5 to 8% by weight of hydroxy silicone oil, 1.2 to 2.5% by weight of silane coupling agent a151, and 5 to 12% by weight of ultrafine graphite.

Preferably, the wear-resistant filler in step S02 is one or more of silicon dioxide, molybdenum disulfide, silicon carbide, boron nitride, graphite, carbon fiber, and alumina.

Preferably, in the step S03, the drying temperature is 20 to 50 ℃, and the drying time is 8 to 10 hours.

Preferably, in step S05, the thickness of the film sheet is 0.05-0.07 mm, and the width is 10-15 cm.

Preferably, in the step S07, the operating temperature of the crimping machine is 200 ℃ to 250 ℃, and the linear velocity is 2-4 m/min. .

Preferably, in the step S06, the diameter of the short fiber is 6-9 um, and the yarn number is 100-150 TEX.

Compared with the prior art, the invention has the beneficial effects that:

(1) the chemical fiber blended yarn has high acid resistance by adding the surface chemical treatment agent, the acid resistance of the chemical fiber blended yarn is far higher than that of GF/PTFE fiber blended yarn, and the service life of the chemical fiber blended yarn is longer than that of common PTFE fiber blended yarn;

(2) the wear-resistant filler is added, so that the fiber body has the advantages of wear resistance and low friction coefficient, the product wear can be reduced, the service life of the product is prolonged, and the fiber quality is improved.

Detailed Description

The technical solutions in the embodiments of the present invention are clearly and completely described below, and it is obvious that the described embodiments are only a part of the embodiments of the present invention, and not all embodiments. All other embodiments, which can be derived by a person skilled in the art from the embodiments given herein without making any creative effort, shall fall within the protection scope of the present invention.