CN105199494B - A kind of fluorocarbon resin coating and preparation method thereof - Google Patents

Abstract

A kind of fluorocarbon resin coating and preparation method thereof, it is related to a kind of building coating and preparation method thereof, using silica surface hydroxyl and the group on p hydroxybenzoic acids surface continuity polymerisation will occur under the conditions of existing for catalyst for the present invention, so as to be modified to the hydrophilic radical of nano-silica surface so that nano silicon dioxide can preferably disperse in organic solvent.Composite coating is made with modified nano silicon dioxide fluorocarbon resin again.This method make the modification of silica be operated in it is more mild under conditions of carry out, overcome it is previous it is silica modified need high temperature, high pressure, strong acid, highly basic condition the drawbacks of.And cause composite coating prepared by its filling that there is stronger corrosion resistance, anti-ultraviolet ageing, resistance to acid and alkali and hydrophobic self-cleaning performance, it is a kind of functional paint having good prospects.

Description

A kind of fluorocarbon resin coating and preparation method thereof

technical field

The invention relates to an architectural coating and a preparation method thereof, in particular to a fluorocarbon resin coating and a preparation method thereof.

Background technique

Fluorocarbon resin has a strong C-F bond as the skeleton. Compared with other resins, it has better heat resistance, chemical resistance, cold resistance, low temperature flexibility, weather resistance and electrical properties. However, due to the short length and high bond energy of the C-F bond of fluorocarbon resin, it has good crystallinity, so it also has the disadvantages of non-adhesion and non-wetting. It can be seen from the above that if the fluorocarbon resin is directly used in the coating, although the coating has good protective performance in a short period of time, due to its non-adhesive and non-wetting characteristics, the coating will easily fall off, thus no longer affecting the substrate. It has a protective effect, which violates the original intention of using paint.

Although nano-SiO ₂ can better improve the shortcomings of fluorocarbon resin coatings, the surface atoms of nano-SiO ₂ particles are highly active, extremely unstable, and easy to agglomerate, and their dispersion in fluorocarbon coatings is poor. Therefore, the surface of nano- _SiO2 must be modified so that it can be better and uniformly dispersed in the fluorocarbon resin coating. Traditional nano-SiO ₂ modification methods are extremely demanding on conditions, and some methods such as high temperature, high pressure, strong acid, strong alkali, and high-cost coupling agent increase the cost of modification, which is not conducive to industrial production.

Contents of the invention

The object of the present invention is to provide a kind of fluorocarbon resin coating and preparation method thereof, the present invention is with nanometer SiO ₂ Modified fluorocarbon resin coating, both can keep the original excellent performance of fluorocarbon resin, can obtain excellent mechanical property again , thermal stability and other properties, but also has strong corrosion resistance, UV aging resistance, acid and alkali resistance, hydrophobic self-cleaning performance and heat and weather resistance.

The purpose of the present invention is achieved through the following technical solutions:

A kind of fluorocarbon resin paint, this paint mass percentage is composed as follows:

Fluorocarbon resin 30%-40%; epoxy resin 5%-10%; p-hydroxybenzoic acid 5%-10%; solvent 30%-40%; leveling agent 0.5%-1%; defoamer 0.5% -2%; nano-silica 5%-8%; dispersant 2%-5%; catalyst 1.5%-5%.

The fluorocarbon resin coating described above is a trifluoro-type FEVE fluorocarbon resin.

In the above-mentioned fluorocarbon resin coating, the primary particle diameter of the nano silicon dioxide particles used is 25-30nm.

In the fluorocarbon resin coating, the volume ratio of xylene and ethylene glycol butyl ether in the mixed solvent is 2:3~4.

For the fluorocarbon resin coating, the leveling agents used are MF3077, RB505, and SC-333.

For the fluorocarbon resin coating, the defoamers used are GPE20 and SPA-202.

For the fluorocarbon resin coating, the dispersant used is a multi-component dispersant, which consists of HDI trimer HX and HDI biuret N75, and the percentage of the two is 10:7~8.

A preparation method of fluorocarbon resin coating, comprising the following preparation steps:

a Add 5%-8% of nano- _SiO2 particles to 5%-10% of a mixed solvent composed of xylene and ethylene glycol butyl ether, adjust the pH to 8-9 with Tris buffer, and then add 5% -10% of p-hydroxybenzoic acid and 1.5%-5% of pyridine, stirred for 2h, suction filtered, washed, and then dried at 120°C-200°C to obtain modified nano- _SiO2 particles;

b Pour 30%-40% fluorocarbon resin and 5%-10% epoxy resin into a three-necked flask, then add 25%-30% mixed solvent, ultrasonic 0.5-1.0h, constant temperature 40 ℃, 5%- Add 8% modified nano- _SiO2 particles to 3%-5% mixed solvent, ultrasonically disperse for 15-30 min, slowly drop the obtained mixed solution into a three-necked flask, mechanically stir for 0.5-1.0h, and then ultrasonically 1 -2 h;

c Add 0.5%-1% leveling agent and 0.5%-2% defoamer to the modified fluorocarbon resin, mechanically stir for 1-2h to disperse evenly, add 2%-5% dispersant, and then high-speed Disperse for 5-30 min to prepare the coating.

Advantage and effect of the present invention are:

1. Fluorocarbon resin coatings modified with nano- _SiO2 can not only maintain the original excellent properties of fluorocarbon resins, but also obtain excellent mechanical properties, thermal stability and other properties, and have strong corrosion resistance and anti-corrosion properties. UV aging resistance, acid and alkali resistance, hydrophobic self-cleaning performance and heat and weather resistance.

2. Use p-hydroxybenzoic acid to modify the surface of nano- _SiO2 , and use the hydroxyl group on the surface of silica to react with the carboxyl group on the surface of p-hydroxybenzoic acid, thereby modifying the hydrophilic groups on the surface of nano-silica, The nano-silica can be better dispersed in organic solvents, and the reaction conditions are relatively mild, which overcomes the disadvantages of high temperature, high pressure, strong acid, and strong alkali conditions required for silica modification in the past, and also avoids the use of silane coupling agents. Easy to cause side effects.

3. The present invention not only overcomes the shortcomings of traditional fluorocarbon resin coatings by using nano-SiO2 to modify fluorocarbon resin, but also obtains excellent mechanical properties and thermal stability, and simultaneously uses p-hydroxybenzoic acid to modify the surface of nano- _SiO2 The processing and operation are simple, the reaction conditions are easy to control, the repeatability is high, the production cost is reduced, and industrial production is easy to realize.

Description of drawings

Fig. 1 The schematic diagram of the synthesis of polyester from p-hydroxybenzoic acid under the catalysis of pyridine;

Fig. 2 Mechanism diagram of polyester modified nano-silica.

Detailed ways

Embodiments of the present invention will be further described in detail through examples below, but the embodiments of the invention are not limited thereto.

a. Add 5% nano- _SiO2 particles to 5% xylene and ethylene glycol butyl ether in a mixed solvent with a volume ratio of 2:3, adjust the pH to 9 with Tris buffer, and then add 8% p-hydroxyl Benzoic acid and 5% pyridine were stirred for 2 hours, filtered with suction, washed, and dried at 150°C to obtain modified nano-SiO ₂ particles.

b. Pour 35% of trifluoro-type FEVE fluorocarbon resin and 10% of epoxy resin into a three-necked flask, and then add 30% of the above mixed solvent; ultrasonic 1.0h, constant temperature 40 ℃. Add 5% of modified nano- _SiO2 particles to 5% of the above mixed solvent; ultrasonically disperse for 30 min, slowly drop the resulting mixed solution into a three-necked flask, mechanically stir for 1.0, and ultrasonically for 2h.

c. Add 1% of MF3077 and 2% of GPE20 to the modified fluorocarbon resin, stir mechanically for 2 hours to disperse evenly; add HDI trimer HX and HDI biuret N75 with a volume percentage of 10:7, and disperse at high speed for 20 minutes. Thus, a coating is produced.

The above are only preferred implementations of the present invention, and are not intended to limit the present invention in any form. Any simple modifications or equivalent changes made to the above embodiments according to the technical essence of the present invention all fall within the scope of protection of the present invention. .

Claims (2)

1. a kind of fluorocarbon resin coating, which is characterized in that coating quality percentage composition is as follows：Fluorocarbon resin 30%-40%；Ring Oxygen resin 5%-10%；P- hydroxybenzoic acids 5%-10%；Solvent 30%-40%；Levelling agent 0.5%-1%；Antifoaming agent 0.5%-2%；Nanometer Silica 5%-8%；Dispersant 2%-5%；Catalyst 1.5%-5%；Fluorocarbon resin used is three fluorine-type FEVE fluorocarbon resins； The primary particle size of nano-silicon dioxide particle used is 25-30nm；The volume of in the mixed solvent dimethylbenzene and butyl glycol ether Than being 2:3~4；Levelling agent used is MF3077, RB505, SC-333；Antifoaming agent used is GPE20, SPA -202；It is used Dispersant for multicomponent dispersant, consisting of HDI tripolymer HX and HDI biuret N75, and the percentage of the two It is 10:7~8.

2. a kind of preparation method of fluorocarbon resin coating, which is characterized in that including following preparation process：

A is by the Nano-meter SiO_2 of 5%-8%₂Particle is added to the in the mixed solvent being made of dimethylbenzene and butyl glycol ether of 5%-10%, PH to 8-9 is adjusted with Tris buffer solutions, then adds in the p- hydroxybenzoic acids of 5%-10% and the pyridine of 1.5%-5%, stirs 2h, is taken out Filter, washing, then modified Nano-meter SiO_2 is dried to obtain at 120 DEG C -200 DEG C₂Particle；

B pours into 30%-40% fluorocarbon resins and 5%-10% epoxy resin in three-necked flask, and the mixing for then adding in 25%-30% is molten Agent, ultrasonic 0.5-1.0h, 40 DEG C of constant temperature, by the modified Nano SiO of 5%-8%₂Particle is added to the in the mixed solvent of 3%-5%, surpasses Sound disperses 15-30 min, and obtained mixed solution is slowly dropped into three-necked flask, ultrasound 1- again after mechanical agitation 0.5-1.0h 2 h；

The antifoaming agent of the levelling agent of 0.5%-1% and 0.5%-2% is added in fluorocarbon modified resin by c, mechanical agitation 1-2h dispersions Uniformly, the dispersant of 2%-5%, then high speed dispersion 5-30 min are added in, so as to which coating be made.