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Polyvinylidene fluoride resin polymer and preparation method thereof

A polyvinylidene fluoride resin and polymer technology, which is applied in the field of polyvinylidene fluoride resin polymer and its preparation, can solve the problems of reduced qualified rate of molded body, long crystallization time, reduced crystallinity and the like, so as to reduce the defective molding rate , The effect of improving impact strength and accelerating the speed of crystallization

Inactive Publication Date: 2017-10-10
LICHANG TECH GANZHOU
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0003] However, when monomers such as vinylidene fluoride form polyvinylidene fluoride resin copolymers, macromolecular chains are introduced, which destroys regularity, reduces crystallinity, and has high melt viscosity, which is easy to process in injection molding and extrusion molding. Warpage and shrinkage of the finished product appear
The melt viscosity of polyvinylidene fluoride is related to the processing temperature and shear rate. The higher the processing temperature and the higher the shear rate, the better the fluidity and the higher the molding rate. However, when the processing temperature is too high or the heating time is too long, the product color It will turn yellow and the brightness will decrease. In addition, high processing temperature, long crystallization time, and high crystallinity will form large spherulites, which will easily cause pinholes and depressions in the product, resulting in a decrease in the qualified rate of the molded body.
[0004] In the existing formula, the addition of inorganic fillers and high molecular polymers, etc., have improved the crystallinity of polyvinylidene fluoride resin to a certain extent and reduced the molding shrinkage rate, but they still cannot withstand high processing temperature, so Increased production costs and decreased production efficiency

Method used

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  • Polyvinylidene fluoride resin polymer and preparation method thereof

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0054] (1) Mixing: polyvinylidene fluoride resin: 90 parts, sodium silicate material: 0.1 part, mica powder: 2 parts, methyl methacrylate: 0.1 part, perfluoroalkyl polyurethane: 1 part, and the raw materials are as follows Add sequentially, first add mica powder and sodium silicate material in the composite nucleating agent for stirring, then add polyvinylidene fluoride resin for stirring, and finally add methyl methacrylate and perfluoroalkyl polyurethane;

[0055] (2) Stirring: heat the raw materials to 100°C and stir for 20 minutes to mix the raw materials evenly;

[0056] (3) Extrusion molding:

[0057] A. the mixture that step (2) is obtained is placed in the feeding device of screw extruder;

[0058] b. The mixture is extruded by the screw and enters the conveying section for preheating. The screw speed is 30r / min, the screw compression ratio is 1:1, and the preheating temperature is 190°C;

[0059] c. The preheated mixture enters the compression section through screw ...

Embodiment 2

[0064] (1) Mixing: polyvinylidene fluoride resin: 93 parts, sodium silicate material: 0.1 part, mica powder: 0.1 part, methyl methacrylate: 0.1 part, perfluoroalkyl polyurethane: 1 part, magnesium oxysulfide crystal Whiskers: 0.1 part, add raw materials in the following order, first add mica powder, sodium silicate material, magnesium oxysulfate whiskers in the composite nucleating agent and stir, then add polyvinylidene fluoride resin and stir, and finally add methacrylic acid Methyl esters, perfluoroalkyl polyurethanes;

[0065] (2) Stirring: heat the raw materials to 100°C and stir for 20 minutes to mix the raw materials evenly;

[0066] (3) Extrusion molding:

[0067] A. the mixture that step (2) is obtained is placed in the feeding device of screw extruder;

[0068] b. The mixture is extruded by the screw and enters the conveying section for preheating. The screw speed is 30r / min, the screw compression ratio is 1:1, and the preheating temperature is 190°C;

[0069] c. Th...

Embodiment 3

[0074] (1) Mixing: polyvinylidene fluoride resin: 95 parts, mica powder: 8 parts, methyl methacrylate: 0.3 parts, perfluoroalkyl polyurethane: 2 parts, magnesium oxysulfide whiskers: 0.2 parts, and the raw materials were pressed according to Add in the following order, first add mica powder and magnesium oxysulfide whiskers in the composite nucleating agent for stirring, then add polyvinylidene fluoride resin for stirring, and finally add methyl methacrylate and perfluoroalkyl polyurethane;

[0075] (2) Stirring: heat the raw materials to 100°C and stir for 25 minutes to mix the raw materials evenly;

[0076] (3) Extrusion molding:

[0077] A. the mixture that step (2) is obtained is placed in the feeding device of screw extruder;

[0078] b. The mixture is extruded by the screw and enters the conveying section for preheating. The screw speed is 35r / min, the screw compression ratio is 2:1, and the preheating temperature is 200°C;

[0079] c. The preheated mixture enters the ...

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Abstract

The invention discloses a polyvinylidene fluoride resin polymer which comprises the following components in parts by weight: 90-100 parts of polyvinylidene fluoride resin, 0.1-1 part of methyl methacrylate, 1-5 parts of perfluoroalkyl polyurethane and 0.3-10.8 parts of compound nucleating agent, wherein the compound nucleating agent is prepared from mica powder and at least one of sodium silicate, magnesium oxysulfate whisker and potassium titanate whisker. The invention can enhance the heat resistance of the polyvinylidene fluoride resin polymer, can increase the crystallizing speed thereof in extruding process, can reduce the shrinking percentage, can greatly improve the degree of crystallinity and can increase the forming rate. Besides, the reject ratio of the end product is reduced and the production efficiency is increased when the resin polymer is injected and processed into an end product. The vicat softening temperature of the resin particle according to the invention at least reaches up to 135 DEG C and the impact resistance at least reaches up to 240Kj / m<2>.

Description

technical field [0001] The invention relates to the field of resin modification, in particular to a polyvinylidene fluoride resin polymer and a preparation method thereof. Background technique [0002] Polyvinylidene fluoride resin (PVDF) combines the characteristics of fluororesin and general-purpose resin. In addition to good chemical corrosion resistance, high temperature resistance, oxidation resistance, weather resistance, and radiation resistance, it also has piezoelectricity, It has special properties such as dielectric and pyroelectric properties, and its continuous maximum service temperature reaches 125°C. It can be melt-processed and can be used to produce anti-corrosion containers. Polyvinylidene fluoride resin is excellent in secondary processability such as machining, bending, and welding after primary processing. [0003] However, when monomers such as vinylidene fluoride form polyvinylidene fluoride resin copolymers, macromolecular chains are introduced, whi...

Claims

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Application Information

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IPC IPC(8): C08L27/16C08L75/04C08K3/34C08K7/08
CPCC08L27/16C08K2201/003C08K2201/004C08K2201/014C08L2201/08C08L2205/24C08L75/04C08K3/34C08K7/08
Inventor 李萍冯兴文刘斌黄学文何发春肖华
Owner LICHANG TECH GANZHOU
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