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PTFE coated particle with core-shell structure and preparation method thereof

A technology of PTFE and core-shell structure, which is applied in the field of preparation of PTFE-coated particles, and can solve the problem of PTFE resin reducing aggregation

Pending Publication Date: 2021-04-09
CHANGSHU 3F ZHONGHAO NEW CHEM MATERIALS +1
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Although the PTFE encapsulation method disclosed in the prior art can advantageously improve the fluidity of the PTFE resin and reduce its aggregation, it is necessary to further improve the performance of the coated PTFE resin particles by increasing its encapsulation degree

Method used

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  • PTFE coated particle with core-shell structure and preparation method thereof
  • PTFE coated particle with core-shell structure and preparation method thereof
  • PTFE coated particle with core-shell structure and preparation method thereof

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preparation example Construction

[0024] The invention relates to a preparation method of a PTFE resin with a core-shell structure. The PTFE resin with a core-shell structure prepared by the method has an improved covering degree.

[0025] In the present invention, the term "coating degree" refers to the covered area of ​​the acrylonitrile shell polymer on the surface of the PTFE resin core, which can be obtained qualitatively from the STEM picture of the coated product, and is reflected in the element quantitative analysis calculation based on the STEM picture The elemental molar ratio of N and F, that is, N / F (mol), and according to the elemental ratio of N / F, calculate the amount of wrapped shell polymer in the total polymer (wt%). .

[0026] 1. The preparation method of the PTFE resin of core-shell structure of the present invention comprises the step of providing the acrylonitrile polymer monomer emulsion that acrylonitrile polymer monomer and emulsifier form.

[0027] The emulsifier suitable for the met...

Embodiment

[0070] testing method

[0071] (i) Determination of solid content of PTFE-coated resin emulsion

[0072] Weigh about 5g of polymerized PTFE-coated resin emulsion, heat at 140°C for 2h, weigh to calculate the solid content, and take the average of three experiments.

[0073] (ii) Determination of coagulation rate of PTFE seed emulsion polymerization

[0074] After the polymerization finishes, filter the PTFE, collect the coagulation rate formed by demulsification in the polymerization process, dry, weigh, and calculate the coagulation rate:

[0075] Agglomeration rate (wt%) = aggregate mass / (aggregate mass + filtered emulsion weight * solid content) * 100%

[0076] (iii) Determination of PTFE-coated resin core-shell structure

[0077] Field emission transmission electron microscopy (STEM) was used to observe the wrapping of the shell polymer on the surface of PTFE particles, and the mapping imaging of N (or polymer monomer-specific elements) and F elements was performed. Th...

Embodiment 1

[0106] Weigh 3g of sodium lauryl sulfate, 3g of tridecyl polyoxyethylene ether, add 75g of deionized water to dissolve; add 24g of styrene and 6g of acrylonitrile to the aqueous solution of the above compounded surfactant for pre-emulsification , to obtain a pre-emulsion. Weigh 50g of PTFE emulsion, dilute the 60wt% PTFE concentrated solution to 20wt%, add 3g sodium lauryl sulfate, 3g tridecyl polyoxyethylene ether and 3g dodecyl mercaptan (NDDM), fully stir , dissolved evenly.

[0107] Weigh 2 g of ammonium persulfate, add deionized water to dissolve completely, and obtain an initiator solution. Take 1 / 5 of the above-mentioned pre-emulsion and add it to the mixture of the above-mentioned PTFE emulsion, stir evenly and then raise the temperature to 85°C. Add the initiator solution. Then add the remaining 4 / 5 pre-emulsion dropwise to the above-mentioned PTFE mixed solution to carry out polymerization reaction, control the drop rate, and finish adding the remaining monomers w...

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Abstract

The invention discloses PTFE coated particles with a core-shell structure and a preparation method thereof. The coated particle comprises a PTFE resin core and an acrylonitrile polymer shell coating layer, the N / F element ratio of the PTFE resin with the core-shell structure is 0.04-0.45 by mole, and the weight of the coated shell polymer accounts for 30-80wt% of the total weight of the polymer. The method comprises the following steps: providing an acrylonitrile polymer monomer emulsion formed by an acrylonitrile polymer monomer and an emulsifier; mixing not more than half of the acrylonitrile polymer monomer emulsion with a PTFE emulsion; and adding an initiator to initiate polymerization reaction of an acrylonitrile monomer; wherein the residual acrylonitrile polymer monomer emulsion is added in the polymerization reaction process.

Description

technical field [0001] The invention relates to a method for preparing coated particles, in particular to a method for preparing PTFE coated particles with a core-shell structure. The coated particles prepared by the method of the invention have an improved core coating surface, and are especially suitable as anti-dripping agents. Background technique: [0002] Polytetrafluoroethylene (PTFE) is widely used in various fields due to its special chemical properties and excellent product performance. PTFE has the characteristic of fibrillation under the action of shear force, and in the process of mixing with other base resins, fibrillation will occur to form a penetrating network structure. In the case of heat, PTFE itself does not burn and has the property of shrinking. Therefore, its interpenetrating fibrous network structure can prevent resin dripping, thereby increasing the flame retardancy of plastic products. In addition, adding PTFE to resins such as ABS and PC as an ...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C08F259/08C08F220/44C08F212/10C08L51/00
CPCC08F259/08C08L51/003C08L2207/53C08F220/44C08F212/10
Inventor 李纯婷范文彬杜丽君纪云
Owner CHANGSHU 3F ZHONGHAO NEW CHEM MATERIALS
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