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Condensing washing method of polyvinylidene fluoride emulsion

A technology of polyvinylidene fluoride and polyvinylidene fluoride resin, which is applied in the field of post-treatment of polymer emulsions, can solve problems such as unfavorable washing and small particle size, achieve good demulsification effect, increase solubility, and reduce water consumption Effect

Active Publication Date: 2014-05-14
ZHONGHAO CHENGUANG RES INST OF CHEMICALINDUSTRY CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

The problems in the technology disclosed in this document are: the particle size after agglomeration is small, and the agglomerated vinylidene fluoride resin is paste-like, which is not conducive to the next step of washing, and the conductivity is still greater than 10 after washing 4 times.

Method used

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  • Condensing washing method of polyvinylidene fluoride emulsion
  • Condensing washing method of polyvinylidene fluoride emulsion

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0027] (1) Add deionized water at a temperature of 8°C to 500mL polyvinylidene fluoride emulsion to adjust the specific gravity of the emulsion to 1.08;

[0028] (2) Turn on the stirring, the stirring speed is controlled at 1400 rpm, and the complete demulsification time is 8 minutes; the average particle size of the PVDF emulsion before coagulation is about 20 μm, and the average particle size after coagulation is 230 μm;

[0029] (3) The polyvinylidene fluoride resin precipitated by coagulation and demulsification is washed with deionized water at a temperature of 80°C for 5 minutes each time (the volume ratio of the polyvinylidene fluoride resin precipitated in the previous step to deionized water is Both are 1:2), washed repeatedly 7 times, measured the conductivity of the deionized water after washing, if it is lower than 10μs / cm, it is qualified (4 times of washing meets the requirements), PVDF is white powder after washing.

Embodiment 2

[0031] (1) Add deionized water at a temperature of 10°C to 500mL polyvinylidene fluoride emulsion to adjust the specific gravity of the emulsion to 1.06;

[0032] (2) Turn on the stirring, the stirring speed is controlled at 1600 rpm, and the complete demulsification time is 5 minutes; the average particle size of the PVDF emulsion before coagulation is about 20 μm, and the average particle size after coagulation is 180 μm;

[0033] (3) The polyvinylidene fluoride resin precipitated by coagulation and demulsification is washed with deionized water at a temperature of 70°C for 8 minutes each time (the volume ratio of the polyvinylidene fluoride resin precipitated in the previous step to deionized water is Both are 1:1.18), washed repeatedly 4 times, measured the conductivity of the deionized water after washing, if it is lower than 10μs / cm, it is qualified, and the PVDF is white powder after washing.

Embodiment 3

[0035] (1) Add deionized water at a temperature of 5°C to 500mL polyvinylidene fluoride emulsion to adjust the specific gravity of the emulsion to 1.12;

[0036] (2) Turn on the stirring, the stirring speed is controlled at 1200 rpm, and the complete demulsification time is 10 minutes; the average particle size of the PVDF emulsion before coagulation is about 20 μm, and the average particle size after coagulation is 200 μm;

[0037] (3) The polyvinylidene fluoride resin precipitated by coagulation and demulsification is washed with deionized water at a temperature of 90°C for 4 minutes each time (the volume ratio of the polyvinylidene fluoride resin precipitated in the previous step to deionized water is Both are 1:6), wash repeatedly 4 times, measure the conductivity of the deionized water after washing, if it is lower than 10μs / cm, it is qualified, and the PVDF is white powder after washing.

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Abstract

The invention relates to a condensing washing method of polyvinylidene fluoride emulsion. The condensing washing method comprises the steps as follows: (1) adding water at 1 to 15 DEG C to polyvinylidene fluoride emulsion; adjusting specific gravity of emulsion to value between 1.04 and 1.18; (2) condensing the polyvinylidene fluoride emulsion obtained in an agitating mode; controlling the agitating speed to 500 to 2000 rotation per minute; completely demulsifying for 1 to 15 minutes; and (3) washing the separated polyvinylidene fluoride emulsion resin after condensing with water. According to the condensing washing method provided by the invention, the production capacity of equipment is greatly improved, water consumption is reduced, the processing period is shortened, and the benefit is brought to the scale industrial production.

Description

technical field [0001] The invention relates to the post-treatment field of polymer emulsions, in particular to a coagulation and washing method for polyvinylidene fluoride emulsions. Background technique [0002] Polyvinylidene fluoride (PVDF) has excellent mechanical strength, impact resistance, radiation resistance, water and chemical resistance, weather resistance and other properties, and has the characteristics of large piezoelectric coefficient, low refractive index, wide frequency response, low impedance and easy matching . The long-term working temperature is -50~150℃, and can be processed by general thermoplastic processing methods. Its outstanding features are high mechanical properties and good chemical stability. Polyvinylidene fluoride is widely used in the manufacture of various wires and cables, chemical pipe fittings, container pipe linings, weather-resistant coatings and films, and piezoelectric films. [0003] The current industrialized polymerization m...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C08F14/22C08F6/22
Inventor 余金龙张建新李斌王先荣赵少春兰军高家勇白鲸
Owner ZHONGHAO CHENGUANG RES INST OF CHEMICALINDUSTRY CO LTD
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