Unlock instant, AI-driven research and patent intelligence for your innovation.

A kind of preparation method and obtained product of polytetrafluoroethylene dispersion resin for pipe extrusion

A technology of polytetrafluoroethylene and dispersing resin, which is applied in the field of preparation methods of polyfluorinated organic compounds and the products obtained, can solve problems affecting the performance and appearance of products, instability of terminal group form, overflow of small molecular substances, etc., and achieve shortening Coagulation time, narrow particle size distribution, and good transparency

Active Publication Date: 2016-05-25
ZHONGHAO CHENGUANG RES INST OF CHEMICALINDUSTRY CO LTD
View PDF8 Cites 0 Cited by
  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0003] Patent CN1986577A discloses the use of ammonium persulfate as an initiator to prepare polytetrafluoroethylene dispersion resin for extruded pipes. The form of its end group is unstable, and it is easy to decompose in the process of product processing, causing small molecular substances to overflow, affecting the performance and appearance of the product

Method used

the structure of the environmentally friendly knitted fabric provided by the present invention; figure 2 Flow chart of the yarn wrapping machine for environmentally friendly knitted fabrics and storage devices; image 3 Is the parameter map of the yarn covering machine
View more

Image

Smart Image Click on the blue labels to locate them in the text.
Viewing Examples
Smart Image
  • A kind of preparation method and obtained product of polytetrafluoroethylene dispersion resin for pipe extrusion
  • A kind of preparation method and obtained product of polytetrafluoroethylene dispersion resin for pipe extrusion
  • A kind of preparation method and obtained product of polytetrafluoroethylene dispersion resin for pipe extrusion

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0037] 50L stainless steel reaction kettle with a spiral stirrer inside. The rotational speed of the stirrer was 60 rpm during the reaction.

[0038]Wash, add 32L of deionized water, 8g of ammonium perfluorooctanoate as a dispersant, 2kg of paraffin wax (melting point 56-58°C, the same below), seal the kettle, evacuate and replace with nitrogen, and analyze the oxygen content. When the oxygen content is less than or equal to 30ppm, it is qualified . After the oxygen analysis is qualified, 50 g of modifier A perfluoropropylene (HFP) and 25 g of modifier B perfluoropropyl vinyl ether (PPVE) are added. The temperature of the reaction kettle was raised to 65±1°C, the gas-phase monomer tetrafluoroethylene was put into the kettle, and the pressure inside the kettle was 2.5MPa, and 7g of succinic acid peroxide and 0.15g of ammonium persulfate were added. During the reaction, the pressure in the kettle was maintained at 2.5MPa, and the temperature was 65-70°C. When the tetrafluoroe...

Embodiment 2

[0041] Utilize the reaction still of embodiment 1, conical plum-blossom coagulation barrel to operate. The rotational speed of the stirrer was 50 rpm during the reaction.

[0042] Clean the 50L stainless steel reaction kettle, add 32L of deionized water, 8g of ammonium perfluorooctanoate as a dispersant, and 2kg of paraffin, then seal the kettle, evacuate and replace with nitrogen, and analyze the oxygen content. When the oxygen content is less than or equal to 30ppm, it is qualified. After the oxygen analysis is qualified, 50 g of modifier A perfluoropropylene (HFP) is added. The temperature of the reaction kettle is raised to 65±1°C, and the gas-phase monomer tetrafluoroethylene is put into the kettle. When the pressure in the kettle is 2.5MPa, 7g of succinic acid peroxide and 0.15g of ammonium persulfate are added, and the modifier B perfluoropropylethylene is continuously added. Base ether (PPVE) 40g. During the reaction, the pressure in the kettle was maintained at 2.5M...

Embodiment 3

[0045] Utilize the reaction still of embodiment 1, conical plum-blossom coagulation barrel to operate.

[0046] Clean the 50L stainless steel reaction kettle, add 32L of deionized water, 8g of ammonium perfluorooctanoate as a dispersant, and 2kg of paraffin, then seal the kettle, evacuate and replace with nitrogen, and analyze the oxygen content. When the oxygen content is less than or equal to 30ppm, it is qualified. After the oxygen analysis is qualified, 50 g of modifier A, chlorotrifluoroethylene (CTFE), is added. The temperature of the reaction kettle is raised to 65±1°C, and the gas-phase monomer tetrafluoroethylene is put into the kettle. When the pressure in the kettle is 2.7MPa, 7g of succinic acid peroxide and 0.15g of ammonium persulfate are added, and the modifier B perfluoroethylethylene is continuously added. Base ether (PEVE) 40g. During the reaction, the pressure in the kettle was maintained at 2.7MPa, and the temperature was 65-70°C. When the tetrafluoroethy...

the structure of the environmentally friendly knitted fabric provided by the present invention; figure 2 Flow chart of the yarn wrapping machine for environmentally friendly knitted fabrics and storage devices; image 3 Is the parameter map of the yarn covering machine
Login to View More

PUM

PropertyMeasurementUnit
melting pointaaaaaaaaaa
diameteraaaaaaaaaa
diameteraaaaaaaaaa
Login to View More

Abstract

The invention provides a preparation method for Teflon dispersion resin for a squeezing tube. The preparation method for the Teflon dispersion resin for the squeezing tube includes the steps that (1) deionized water, dispersing agents and paraffin are added into a sealed reaction still to form liquid phase, the air in the reaction still is replaced by nitrogen gas, and then modifier is added into the reaction still, wherein the modifier is composed of modifier A and modifier B; (2) the temperature of the reaction still is increased to 60-80 DEGC, gas-phase monomer is input until the pressure inside the reaction still is 1.5-3.0 MPa, initiator is added, and the polymerization reaction starts; (3) the polymerization reaction is not stopped until the weight of the input gas-phase tetrafluoroethylene monomer accounts for 35-60 percent of the weight of the deionized water. According to the method, a combined initiating system is used in the polymerization process, the modifier A and modifier B are added, a helical ribbon agitator is arranged, a proper stirring speed, pressure and temperature are adopted, and in the after-treatment process, a conical multi-petaled plum-flower-shaped bucket is used for agglomeration to obtain the Teflon dispersion resin.

Description

technical field [0001] The invention belongs to the field of organic macromolecular compounds, and in particular relates to a preparation method of polyfluorinated organic compounds and a prepared product. Background technique [0002] PTFE has excellent chemical corrosion resistance, high and low temperature resistance, aging resistance, low friction, non-stickiness, and physiological inertia, making it an indispensable specialty in chemical, mechanical, electrical, construction, medical and other fields. material, it can be used for a long time in the temperature range of -250 ~ 250 ℃. The preparation of extruded polytetrafluoroethylene resin began to be studied in the 1940s. It is a major branch of polytetrafluoroethylene resin, second only to the output of suspended polytetrafluoroethylene resin. With the advancement of dispersion resin molding and processing technology and the expansion of the application range of PTFE resin, the quality of extruded PTFE dispersion res...

Claims

the structure of the environmentally friendly knitted fabric provided by the present invention; figure 2 Flow chart of the yarn wrapping machine for environmentally friendly knitted fabrics and storage devices; image 3 Is the parameter map of the yarn covering machine
Login to View More

Application Information

Patent Timeline
no application Login to View More
Patent Type & Authority Patents(China)
IPC IPC(8): C08F214/26C08F214/28C08F214/24C08F214/22C08F216/14C08F2/01
Inventor 苏小龙张建新胡显权姚权卫秦向明张春静罗湘华
Owner ZHONGHAO CHENGUANG RES INST OF CHEMICALINDUSTRY CO LTD
Features
  • R&D
  • Intellectual Property
  • Life Sciences
  • Materials
  • Tech Scout
Why Patsnap Eureka
  • Unparalleled Data Quality
  • Higher Quality Content
  • 60% Fewer Hallucinations
Social media
Patsnap Eureka Blog
Learn More

Browse by: Latest US Patents, China's latest patents, Technical Efficacy Thesaurus, Application Domain, Technology Topic, Popular Technical Reports.

© 2025 PatSnap. All rights reserved.Legal|Privacy policy|Modern Slavery Act Transparency Statement|Sitemap|About US| Contact US: help@patsnap.com