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Bacteriostatic polyvinylidene fluoride porous membrane and preparation method thereof

A technology of polyvinylidene fluoride and porous membrane, which is applied in the field of antibacterial polyvinylidene fluoride porous membrane and its preparation, can solve the problems of difficulty in ensuring compatibility, low dosage, and difficulty in dispersing pure antibacterial agents, and achieves a reduction in Compatibility requirements, easy industrialization, and the effect of broadening the range of choices

Active Publication Date: 2022-07-29
SHANDONG ZHAOJIN MOTIAN
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, the amount of bacteriostat added generally accounts for a very low amount in the overall formula, and the compatibility with the body is also difficult to ensure. Therefore, when using thermally induced phase separation to prepare porous membranes containing polymer antibacterial agents, pure bacteriostats should be used It is difficult to directly and well disperse in the porous membrane preparation system; and the liquid polymer antibacterial agent is generally an aqueous solution containing a certain mass concentration of active ingredients, and it is also difficult to directly add to the membrane system.
[0008] The physical and chemical properties of hollow products prepared by thermal phase separation are excellent, but the existing bacteriostatic modification methods have shortcomings. Therefore, it is urgent to develop a high-efficiency method based on thermal phase separation to prepare long-acting antibacterial and Polyvinylidene fluoride porous membrane with excellent other indicators

Method used

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  • Bacteriostatic polyvinylidene fluoride porous membrane and preparation method thereof

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Experimental program
Comparison scheme
Effect test

Embodiment 1

[0056] 1) Preparation of modified masterbatch for the preparation of antibacterial polyvinylidene fluoride nanoporous membrane: Grind nano calcium carbonate through a 325 mesh screen, and then add the ground and sieved powder into a high-speed mixer, while stirring Add the perfluorosulfonate solution as a modified additive to the nano-calcium carbonate in the form of spray, and stir at a high speed for 10 minutes; then move the pretreated powder to an ultrasonic processor with high-speed stirring, add PHMG (PH) (i.e. Polyhexamethylene guanidine phosphate, a derivative of polyhexamethylene guanidine) water preparation, stir under 30KHZ ultrasonic conditions for 20min, then add high molecular weight polyvinylidene fluoride with MFR of 2.0g / 10min (230℃, 21.6kg). Ethylene powder, stir evenly; then introduce the mixture into the twin-screw extruder, knead at 200 ℃, and at the same time multi-stage vacuuming to discharge small molecular volatiles (ie water vapor and low boiling point...

Embodiment 2

[0067] 1) Modified masterbatch for the preparation of antibacterial polyvinylidene fluoride porous membrane: Grind nano calcium carbonate through a 325-mesh sieve, and then add the ground and sieved powder into a high-speed mixer. The fluorocarboxylic acid solution was added to the nano-calcium carbonate in the form of spray, and stirred at a high speed for 10 minutes; then the pretreated powder was moved to an ultrasonic processor with high-speed stirring, and a water agent containing carboxymethyl chitosan was added, under the condition of 30KHZ Stir for 20min, then add high molecular weight polyvinylidene fluoride powder with MFR of 2.0g / 10min (230°C, 21.6kg), stir evenly; then introduce the mixture into a twin-screw extruder, knead at 190°C, and simultaneously multi-stage Vacuumize to discharge small molecule volatiles (ie water vapor and low boiling point substances), and the vacuum degree is -0.4~-0.7bar.

[0068] The weight percent of each component of the prepared modi...

Embodiment 3

[0076] 1) Preparation of antibacterial nano calcium carbonate masterbatch: Grind nano calcium carbonate through a 325 mesh screen, then add the ground and sieved powder into a high-speed mixer, while stirring, spray the perfluorocarboxylic acid solution in the form of a spray Add nano calcium carbonate, stir at high speed for 10min; then move the pretreated powder to an ultrasonic processor with high speed stirring, add PHMG (GL) (ie polyhexamethylene guanidine gluconate, polyhexamethylene guanidine) A derivative of guanidine) water agent, stir at 30KHZ for 20min, then add high molecular weight polyvinylidene fluoride powder with MFR of 2.0g / 10min (230℃, 21.6kg), stir evenly; Screw extruder, kneading at 200 °C, and at the same time multi-stage vacuuming to discharge small molecular volatiles (ie water vapor and low boiling point substances), the vacuum degree is -0.5~-0.8bar.

[0077] The weight percent of each component of the prepared modified master batch is as follows:

...

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Abstract

The invention relates to a bacteriostatic polyvinylidene fluoride porous membrane which is prepared from the following raw materials: modified master batch, polyvinylidene fluoride and organic liquid in a weight ratio of 1: 1: 1-1: 1: 2, the modified master batch is prepared from the following raw materials in percentage by weight: 10-15% of polyvinylidene fluoride; 50 to 60% of inorganic powder; 20-30% of a polymer bacteriostatic agent liquid preparation; and 1-5% of a modified additive. The invention also relates to a preparation method of the antibacterial polyvinylidene fluoride porous membrane. The preparation method comprises the following steps: firstly, preparing the modified master batch; adding the modified master batch, polyvinylidene fluoride and organic liquid into a double-screw extruder in percentage by weight in a continuous weighing feeding manner, and heating, melting, mixing and extruding; the melt is homogenized at 180-230 DEG C and then sprayed out through a metering pump and a mouth mold; and after cooling and molding, volatile components are extracted. According to the method, the polyvinylidene fluoride porous membrane with long-acting bacteriostasis and excellent other indexes can be efficiently prepared on the basis of a thermally induced phase separation method.

Description

technical field [0001] The invention belongs to the technical field of polymer materials, and particularly relates to a bacteriostatic polyvinylidene fluoride porous membrane and a preparation method thereof. Background technique [0002] Membrane separation technology is one of the most efficient, energy-saving and environmentally friendly separation technologies in the field of water treatment. At the same time, due to its strong controllability of separation accuracy, good and stable separation effect, it is widely used in advanced sewage treatment, battery diaphragms, medical materials. and other aspects. [0003] Polyvinylidene fluoride has the characteristics of outstanding chemical resistance, high temperature resistance and stable properties, which provides a variety of choices for its processing methods. Therefore, polyvinylidene fluoride is the main raw material for ultra-microfiltration membranes. Microbial contamination is a major source of contamination in th...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C08L27/16C08L79/00C08L5/08C08J9/26C08J9/28C08J5/18C08J3/22
CPCC08J9/26C08J9/28C08J5/18C08J9/0061C08J3/226C08J2327/16C08J2427/16C08J2479/00C08J2405/08C08J2201/0444
Inventor 张伟政王乐译徐志成王旭梅
Owner SHANDONG ZHAOJIN MOTIAN
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