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Process for preparing Teflon high-temperature cloth based on impregnation method

A Teflon, high temperature cloth technology, applied in textiles and papermaking, etc., can solve the problems of complex impregnation process, poor high temperature resistance, long time consumption, etc., and achieves retention of existing characteristics, excellent high temperature resistance, and simple production process. Effect

Active Publication Date: 2022-02-18
HUANGSHAN MEAO COMPOSITE MATERIALS CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

[0003] Chinese patent CN 106283684A discloses a preparation method of modified Teflon cloth, which includes the following steps: the non-alkali glass fiber cloth advances at a constant speed under the intelligent control of the equipment, and is fully impregnated with a specific proportion of Conductive carbon powder, polytetrafluoroethylene glue of fumed silica powder used as matte powder and heated, then baked and sintered, and finally cooled, the finally obtained Teflon glass fiber cloth has a certain Strength and elasticity, the matte surface reflects little light, can stick a small amount of fine substances, but not too much; but its high temperature resistance is not good, the maximum heat is 250 ℃, which restricts its application in baking utensils , and the impregnation process of the invention is complex and time-consuming
[0004] Chinese patent CN 110117908A discloses a Teflon high-temperature coated cloth, its manufacturing method and its application, including the following steps: S1: After drying the glass fiber cloth, put it into a deionized aqueous solution for 8-10 minutes and then dry it ; S2: Prepare 50% and 60% polytetrafluoroethylene emulsions; S3: first dipping: soak the dried glass fiber cloth in 60% polytetrafluoroethylene emulsion for 2 minutes, dry ; The second dipping: put the dried glass fiber cloth into 60% polytetrafluoroethylene emulsion for 2 minutes and dry it; the third dipping: put the dried glass fiber cloth into 50% polytetrafluoroethylene emulsion Immerse in polytetrafluoroethylene emulsion for 2 minutes, and dry; S4: Sinter the dried glass fiber cloth and heat press; in order to increase the bonding degree of glass fiber cloth and impregnating liquid in this invention, add Epoxy phenolic resin emulsion, although it increases the adhesion, but epoxy phenolic resin will release toxic gases such as formaldehyde, which restricts its application in baking utensils

Method used

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  • Process for preparing Teflon high-temperature cloth based on impregnation method
  • Process for preparing Teflon high-temperature cloth based on impregnation method
  • Process for preparing Teflon high-temperature cloth based on impregnation method

Examples

Experimental program
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Effect test

Embodiment 1

[0030] The present embodiment prepares a kind of modified graphene oxide, and the steps are as follows:

[0031] Step A1. Add 0.05 mol of diphenylmethane diisocyanate and 58 mL of benzene into a three-necked flask in a water bath, stir for 10 minutes, add 0.025 mol of biuret, and stir at 80°C for 1 hour. After the reaction, remove the solvent benzene by rotary evaporation , to obtain intermediate 1;

[0032]Step A2: Add 1.3g of graphene oxide and 65.8mL of DMF into a three-necked flask, ultrasonically disperse at a frequency of 40kHz for 10min, then add 0.3g of intermediate 2 and dibutyltin dilaurate to the three-necked flask, heat up to reflux for 2h, After the reaction, cool to room temperature, transfer the reaction product to ice water, stir at 100r / min for 20min, centrifuge, wash the precipitate with acetone and distilled water three times in sequence, and finally dry it in an oven at 60°C to constant weight to obtain an intermediate product ; The consumption of dibutylt...

Embodiment 2

[0035] The present embodiment prepares a kind of modified graphene oxide, and the steps are as follows:

[0036] Step A1. Add 0.05mol of diphenylmethane diisocyanate and 60mL of benzene into a three-necked flask in a water bath, stir for 10 minutes, add 0.025mol of biuret, and stir at 80°C for 1 hour. After the reaction, remove the solvent benzene by rotary evaporation , to obtain intermediate 1;

[0037] Step A2: Add 1.4g of graphene oxide and 70.5mL of DMF into a three-necked flask, ultrasonically disperse at a frequency of 45kHz for 10min, then add 0.4g of intermediate 2 and dibutyltin dilaurate to the three-necked flask, heat up to reflux for 3h, After the reaction, cool to room temperature, transfer the reaction product to ice water, stir at 150r / min for 20min, centrifuge, wash the precipitate with acetone and distilled water three times in sequence, and finally dry it in an oven at 60°C to constant weight to obtain an intermediate product ; The consumption of dibutyl ti...

Embodiment 3

[0040] The present embodiment prepares a kind of modified graphene oxide, and the steps are as follows:

[0041] Step A1. Add 0.06 mol of diphenylmethane diisocyanate and 64 mL of benzene into a three-necked flask in a water bath, stir for 10 minutes, add 0.025 mol of biuret, and stir at 80°C for 1 hour. After the reaction, remove the solvent benzene by rotary evaporation , to obtain intermediate 1;

[0042] Step A2: Add 1.5g of graphene oxide and 72.4mL of DMF into a three-necked flask, ultrasonically disperse at a frequency of 50kHz for 10min, then add 0.5g of intermediate 2 and dibutyltin dilaurate to the three-necked flask, heat up to reflux for 4h, After the reaction, cool to room temperature, transfer the reaction product to ice water, stir at 200r / min for 20min, centrifuge, wash the precipitate with acetone and distilled water three times in sequence, and finally dry it in an oven at 60°C to constant weight to obtain an intermediate product ; The consumption of dibutyl...

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Abstract

The invention relates to a process for preparing Teflon high-temperature cloth based on an impregnation method, and belongs to the technical field of Teflon cloth preparation. The process comprises the following steps: 1, placing glass fiber base cloth in an impregnation liquid, carrying out ultrasonic treatment at 80-90 DEG C, impregnating for 30 min, taking out, drying at 100-120 DEG C for 30 min, and drying at 125-150 DEG C for 30 min to obtain a Teflon cloth crude product; and 2, baking the Teflon cloth crude product for 4-6 minutes at the temperature of 275-285 DEG C, sintering the above for 8-15 minutes at the temperature of 360-370 DEG C, and cooling to obtain the Teflon high-temperature cloth prepared based on the impregnation method. Modified graphene oxide and the high-temperature-resistant acrylate are added, so that the adhesion between the impregnation liquid and the base cloth and the high-temperature resistance of the Teflon cloth are improved; and compared with a traditional production process, the process is simple, safe and environmentally friendly, the existing characteristics of the Teflon cloth are reserved, and meanwhile the Teflon cloth has the excellent high-temperature resistance.

Description

technical field [0001] The invention belongs to the technical field of Teflon cloth preparation, and in particular relates to a process for preparing Teflon high-temperature cloth based on a dipping method. Background technique [0002] Teflon cloth, the scientific name is polytetrafluoroethylene coated glass fiber cloth. The Teflon cloth on the market is made of alkali-free or medium-alkali glass fiber cloth dipped in PTFE (also known as polytetrafluoroethylene or Teflon) suspension emulsion, and then sintered in a high temperature environment. [0003] Chinese patent CN 106283684A discloses a preparation method of modified Teflon cloth, which includes the following steps: the non-alkali glass fiber cloth advances at a constant speed under the intelligent control of the equipment, and is fully impregnated with a specific proportion of Conductive carbon powder, polytetrafluoroethylene glue of fumed silica powder used as matte powder and heated, then baked and sintered, and ...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): D06N3/04D06N3/00
CPCD06N3/047D06N3/0059D06N3/0063D06N3/0022D06N2205/023D06N2209/10D06N2209/06D06N2209/143D06N2209/16
Inventor 胡少鹏邱惠平
Owner HUANGSHAN MEAO COMPOSITE MATERIALS CO LTD
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