Preparation method of fluororesin emulsion impregnating agent and preparation method of coated fabric

The method for preparing a fluororesin emulsion impregnating agent, which features the following steps:

① Pre-preparation of mixture A, including components fluororesin, coupling agent, water-based silicone latex, FA-series fluorinated surfactant and water;

② Pre-preparation B mixture includes components silicone surfactant, silane coupling agent, and water;

③ To prepare the impregnating agent, mix A mixture, B mixture, acidic pH adjuster, and alkaline viscosity adjuster until evenly mixed. Until there is no sinking or condensation, the impregnating agent is obtained. The invention also discloses a preparation method of coated fabric cloth. Compared with the existing technology, the advantage of the present invention is that the obtained fluororesin coating base is used to prepare baking mats, baking pans, and baking baskets, and has long-term heat resistance up to +260°C without deformation, shrinkage, or oil staining. It has the advantages of corrosion resistance, light weight, smooth surface, self-cleaning, and high temperature and flame retardant.

1. A method for preparing fluororesin emulsion impregnating agent, which is characterized by including the following steps:

① Pre-prepared mixture A, according to the following components and weight ratio:
Fluorine resin     51.9%~59.1%;
Coupling agent    0.5%~5%;
0.5% to 7% of water-based silicone latex with a pH value of 4 to 6. The water-based silicone latex is Jiangsu HA-920 or one of the Magnasoft series XE-175, JSS, and 707 of the American GE Company;
FA-series fluorinated surfactants  0.5% to 3.5%;
The rest is water,
Mix and stir the above A mixture components evenly until there is no settling or condensation, and then set aside;

②Pre-prepared B mixture, according to the following components and weight ratio:
Silicone surfactant   3% ~ 15%;
A silane coupling agent   3%~10%;
The rest is water,
Mix and stir the above B mixture components evenly until there is no sinking phenomenon, and then set aside;

③ Prepare the impregnating agent according to the following components and weight ratio:
A mixture     84.5%~97.3%;
B mixture     1.2%~10.5%;
Acid pH adjuster     0.5%~3.5%;
Alkaline viscosity adjuster     0.5%~3.5%,
Mix and stir the above-mentioned impregnating agent components evenly until there is no sedimentation or condensation, and the impregnating agent is obtained.

2. The preparation method according to claim 1, characterized in that the fluororesin and water in step ① adopt a fluororesin emulsion with a mass percentage of 60%, and the fluororesin emulsion accounts for 86.5% to 98.5% of the mass of the A mixture.
3. The preparation method according to claim 2, characterized in that the 60% fluororesin emulsion in step ① is polytetrafluoroethylene emulsion.
4． The preparation method according to claim 1, characterized in that a pigment agent with a weight percentage of 0.5 to 5% is added to the B mixture in step ②, and then stirred evenly with a ball mill.
5. The preparation method according to claim 4, characterized in that the ball milling conditions in step ② are as follows: the diameter of the alumina ball for ball milling is 20 to 40 mm, the rolling speed of the ball mill is 1 to 500 rpm, and the ball milling time is 1 to 80 hours.
6. The preparation method according to claim 1, characterized in that in step ①, the A mixture component is stirred in a container with a stirring device, the rotation speed is 60 to 90 rpm, the stirring time is 2 to 5 hours, and after stirring The pH value of A mixture component is maintained at 5 to 6.
7． The preparation method according to claim 1, characterized in that in step ③, the impregnating agent component is stirred in a container with a stirring device, the rotation speed is 1 to 200 rpm, and the stirring time is 1 to 15 hours.
8. A method for preparing coated fabric using any impregnating agent of claims 1 to 7, characterized in that the fabric is passed through a container containing the impregnating agent, and then dried at 80 to 120°C for 2 to 5 minutes. Then dry at 200-300°C for 2-5 minutes, and finally sinter at 360-380°C for 2-5 minutes.
9. The preparation method according to claim 8, characterized in that the fabric cloth adopts E-type 5-9 micron glass fiber single yarn, Kevlar fiber, carbon fiber or ceramic fiber.