Core-shell type emulsion with PTFE as core and preparing method thereof

A core-shell emulsion technology, applied in the field of core-shell emulsion and its preparation, to achieve the effects of good hydrophobicity, outstanding comprehensive performance, and high conversion rate

Inactive Publication Date: 2016-07-06
ANHUI UNIVERSITY
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

[0004] The purpose of the present invention is to provide a core-shell emulsion with PTFE as the core and its preparation method, aiming at effectively improving the adhesion between tetrafluoroethylene coating and rubber surface

Method used

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  • Core-shell type emulsion with PTFE as core and preparing method thereof
  • Core-shell type emulsion with PTFE as core and preparing method thereof
  • Core-shell type emulsion with PTFE as core and preparing method thereof

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preparation example Construction

[0031] Such as figure 1 As shown, the preparation method of the core-shell emulsion with PTFE as the core of the embodiment of the present invention comprises the following steps:

[0032] S101: Preparation of seed emulsion: In the three-necked flask 3 equipped with a constant pressure dropping funnel 1 and a spherical condenser 2, add polytetrafluoroethylene dispersion in parts by mass: 0-100 parts by mass and deionized water: 50- 900 parts by mass, stirred evenly, with a rotation speed of 250-400 rpm, and heated to a reaction temperature of 70-90°C in a nitrogen atmosphere to obtain a seed emulsion;

[0033] S102: Preparation of core-shell emulsion with polytetrafluoroethylene as the core: add the mixed monomer dropwise through a constant pressure low liquid funnel, according to the total amount of monomers in parts by mass: 10 to 100 parts by mass, swell for 5 to 20 minutes, and then Add 0.01-3 parts by mass of initiator to initiate polymerization, react for 24 hours, filt...

Embodiment 1

[0039]Get 12g polytetrafluoroethylene dispersion (240nm in particle size, 57wt% solid content) and 120g deionized water and mix uniformly in 250ml three-necked flask 3, stirring speed is 300rpm, feed nitrogen simultaneously, be heated to reaction temperature 75 ℃, Obtain seed emulsion; Get each 8g of MMA and BA, constitute mixed monomer, drop in the three-necked flask 3 by constant pressure dropping funnel 1, drip in 30min, swelling 15min, add potassium persulfate solution (0.12gKPS is dissolved in 10 g deionized water) to initiate polymerization, react for 24 hours, filter with 100 mesh nylon mesh after the reaction is completed, adjust the pH value of the solution to 7-8 with ammonia water after cooling, and prepare the core-shell type PTFE-P (MMA-BA) emulsion.

[0040] Figure 5 It is the TEM picture of the emulsion particles of Example 1 after being dyed with phosphotungstic acid. It can be clearly seen that the emulsion particles have a core-shell structure, wherein the b...

Embodiment 2

[0042] Get 12g polytetrafluoroethylene dispersion (240nm in particle size, 57wt% solid content) and 120g deionized water and mix uniformly in 250ml three-necked flask 3, stirring speed is 300rpm, feed nitrogen simultaneously, be heated to reaction temperature 75 ℃, Obtain seed emulsion; Get 8.7gMMA and 7.3gBA to form mixed monomer, add dropwise in the three-necked flask 3 by constant pressure dropping funnel 1, drip in 30min, swelling 15min, add potassium persulfate solution (0.12gKPS is dissolved in 10g deionized water) to initiate polymerization, react for 24 hours, filter with 100-mesh nylon mesh after the reaction is completed, adjust the pH value of the solution to 7-8 with ammonia water after cooling, and prepare the core-shell type PTFE-P (MMA-BA) emulsion.

[0043] Figure 6 It is the TEM picture of the emulsion particles of Example 2 after being dyed with phosphotungstic acid. It can be clearly seen that the emulsion particles have a core-shell structure, wherein the ...

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Abstract

The invention discloses core-shell type emulsion with PTFE as a core and a preparing method thereof. PTFE dispersion liquid and deionized water are added into a three-necked flask with a constant-pressure dropping funnel and a spherical condenser pipe according to mass parts to be stirred evenly and heated in nitrogen so that seed emulsion can be obtained; mixed monomer is dropped through the constant-pressure dropping funnel, the total amount of monomer is 10-1,000 according to mass parts, swelling is conducted, then, initiator is added for initiating polymerization, reaction is conducted for 24 h, filtering is conducted, ammonium hydroxide is used for adjusting the pH value of the solution after cooling, and the core-shell type emulsion with PTFE as the core is obtained. The level of the adhesive force of an emulsion coating and a rubber surface can reach 4B, and the adhesive force is improved remarkably; contact angle and water absorption test results of emulsion rubber films show that the contact angle of the emulsion latex films can reach 117.94 degrees, the water absorption can be as low as 9.62wt%, and the hydrophobicity of the emulsion latex film is good through comprehensive analysis.

Description

technical field [0001] The invention belongs to the technical field of polymer materials, and in particular relates to a core-shell emulsion with PTFE as the core and a preparation method thereof. Background technique [0002] Polytetrafluoroethylene (PTFE) has the characteristics of heat resistance, weather resistance, chemical corrosion resistance and low surface tension, mainly due to the high and stable bond energy of the C-F bond in PTFE, and the molecule is a helical configuration, C-C The main chain is completely covered by the bulky fluorine atoms. A large number of studies have shown that adding PTFE to composite materials can make the material exhibit excellent heat resistance, chemical corrosion resistance, and hydrophobic and oleophobic properties. PTFE is widely used in modern architecture, porous membranes, optics, microelectronics, waterproof materials, ultra-low dielectric materials and coatings. However, PTFE has poor compatibility and surface adhesion wit...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C08F220/14C08F220/18C08F212/08C08F2/01
CPCC08F2/01C08F220/14C08F220/18C08F220/1804C08F212/08
Inventor 钱家盛尹玉苗继斌陈鹏夏茹杨斌
Owner ANHUI UNIVERSITY
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