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Method for preparing polyvinylidene fluoride (PVDF)-constructed composite particles with nuclear shell interpenetrating network structure

A technology of interpenetrating network structure and polyvinylidene fluoride, which is applied in the field of preparation of core-shell interpenetrating network structure composite particles, can solve the problems of changing crystalline properties, high melting temperature, difficult processing, etc., and achieves excellent anti-aging and performance. Excellent effect of improving melt processability

Inactive Publication Date: 2012-05-02
HEBEI UNIV OF TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0005] The present invention aims at problems such as high melting temperature, poor fluidity and difficult processing of PVDF in the processing process, and provides a kind of seed emulsion copolymerization using polymer monomers that are compatible (or incompatible) with PVDF, By preparing composite particles with a core-shell interpenetrating network structure, it is possible to change the crystallization properties of PVDF, thereby improving the compatibility of PVDF with other polymers, and its processing, film-forming, dielectric and ferroelectric properties.

Method used

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  • Method for preparing polyvinylidene fluoride (PVDF)-constructed composite particles with nuclear shell interpenetrating network structure
  • Method for preparing polyvinylidene fluoride (PVDF)-constructed composite particles with nuclear shell interpenetrating network structure
  • Method for preparing polyvinylidene fluoride (PVDF)-constructed composite particles with nuclear shell interpenetrating network structure

Examples

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Embodiment example 1PV

[0026] Implementation Case 1 Preparation of PVDF / PtBA Core-Shell Structured Composite Particles

[0027]

[0028] In a 100ml beaker, 2.6480g of PVDF seed emulsion (industrial product) with a solid content of 19.45% and an average particle diameter of 235nm was added, followed by 55.0g of deionized water, and ultrasonically dispersed for 40 minutes. The ultrasonically dispersed emulsion was poured into a four-necked reaction flask equipped with a magnetic stirrer, a condenser tube, and a nitrogen inlet tube, the stirring was started and nitrogen gas was introduced, and the stirring rate was set at 300 rpm. After 15 minutes, the temperature of the reaction system was started, and 2.4870 g of tert-butyl acrylate was added to the reaction flask at the same time, and the cooling water of the reflux condenser was opened. When the temperature of the system was raised to 65°C, 5ml of an aqueous solution containing 0.0152g of potassium persulfate was added at one time, and the react...

Embodiment example 2～3

[0032]The polymerization reaction time of the implementation cases 2 to 3 is 30 minutes and 45 minutes respectively, and the rest of the implementation process is the same as that of the implementation case 1. The morphological SEM photographs of the composite particles prepared by implementation cases 2 to 3 are shown in the appendix respectively. image 3 , Figure 5 , the particle size distribution diagrams of the composite particles prepared in implementation cases 2 to 3 are shown in the attached Figure 4 and Image 6 . from image 3 It can be seen from the SEM photos that the composite latex particles in this system are not regular spherical, but special-shaped particles with an asymmetric structure. At this time, the average size of the composite latex particles is 308nm, which is higher than that of PVDF seeds with an average particle size of 235nm. , an increase of 73nm.

[0033] from Figure 5 We can clearly see that as the aggregation time increases, in ima...

Embodiment example 4～5

[0035] In embodiment case 4~5, polymerization temperature is 65 ℃, and the add-on of tBA monomer is respectively 1.5461g ( Figure 7 .b), 2.0649g( Figure 7 .c), and the rest of the operation steps are the same as the implementation case 1. The DSC curve of the composite particles prepared by implementation cases 4-5 is shown in Figure 7 . from Figure 7 It can be clearly seen that the crystallization temperature of PVDF decreases gradually from 142.5°C with the increase of the coating amount of PtBA polymer. When the feed ratio of seed to monomer is 1:4, the crystallization temperature of PVDF drops to 71.4°C. Therefore, the preparation method of the composite particles obviously changes the crystallization behavior of PVDF, so as to improve the melting processability of PVDF and the compatibility with other polymers.

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Abstract

The invention discloses a method for preparing polyvinylidene fluoride (PVDF)-constructed composite particles with a nuclear shell interpenetrating network structure. The method comprises the following steps of: adding deionized water into PVDF seed emulsion, performing ultrasonic dispersion, adding monomers, after the temperature of a system is raised to reaction temperature, adding initiator, and polymerizing; and decompressing the emulsion, drying at low temperature until the weight of the emulsion is constant to prepare the composite particles with the nuclear shell interpenetrating network structure. The composite particles with the nuclear shell interpenetrating network structure are formed based on PVDF seeds, effectively combine the respective characteristics of two polymers, and have complementary advantages of the two polymers; the crystallization temperature of PVDF can be reduced from 142.5 DEG C to 71.4 DEG C in differential scanning calorimetry (DSC); and melting processability of the PVDF, and the compatibility between the PVDF and other polymers which are not compatible with the PVDF are improved, the dielectric performance, piezoelectric performance, ferroelectric performance and other performance of the PVDF can be improved, and the composite particles can be widely applied to the fields of optical fiber coating, outdoor painting and coating, dental repairing and the like.

Description

Technical field: [0001] The invention belongs to the modification of polyvinylidene fluoride (PVDF). Specifically, it is a preparation method of core-shell interpenetrating network structure composite particles based on polyvinylidene fluoride. technical background: [0002] PVDF is a fluoroplastic with high tensile strength. It also has good impact strength and wear resistance, as well as excellent UV resistance and aging resistance. It is very stable to ultraviolet radiation with a wavelength of 200-400nm, and its film material will not be brittle or cracked after being placed outdoors for one to twenty years. PVDF has good chemical stability and will only swell or partially dissolve in a few chemical reagents such as oleum, ketones, strong alkalis, and ethers. Moreover, PVDF has the least amount of chlorine permeation among fluoroplastics, and has good airtightness. At present, it has been widely used in the fields of chemical industry, electronics, textile, food, fuel...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C08F259/08C08F2/22
Inventor 潘明旺韩伟徐海军张广林祝磊袁金凤
Owner HEBEI UNIV OF TECH
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