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CN-121974730-A - High-temperature-resistant coating for inner wall of hot drink cup and preparation method thereof

CN121974730ACN 121974730 ACN121974730 ACN 121974730ACN-121974730-A

Abstract

The invention relates to a high-temperature-resistant coating for the inner wall of a hot beverage cup and a preparation method thereof, belonging to the technical field of hot beverage cup coating preparation, wherein the high-temperature-resistant coating for the inner wall of the hot beverage cup comprises an impact-resistant layer and a compact layer; the impact-resistant layer is attached to the wall of the hot drink cup, the compact layer is attached to the impact-resistant layer, the impact-resistant layer and the compact layer are formed by firing the hot drink cup in a kiln, and the impact-resistant layer and the compact layer are respectively prepared by firing ceramic sol serving as a base material after respectively mixing anti-falling fiber materials and compact powder. The impact-resistant layer takes polycrystalline mullite ceramic fibers and basalt fibers as a framework and is reinforced by matching with silicon carbide whiskers, so that the impact resistance and the fracture resistance of the coating are greatly improved, the problems that the traditional coating is cracked and falls off when being slightly collided are solved, the dense layer takes kaolin as a base, and is compounded with fluxing agents such as potassium feldspar, wollastonite and the like, and a dense glaze is formed after firing, so that the surface is smooth and clean, no pinholes are formed, the hot drink is effectively prevented from being infiltrated and corroded, and the high temperature resistance of the coating is improved.

Inventors

  • XU HUI
  • XU QINMIN
  • Hou Mingzhu

Assignees

  • 江苏凯序金原纸塑包装有限公司

Dates

Publication Date
20260505
Application Date
20260203

Claims (8)

  1. 1. The high-temperature-resistant coating for the inner wall of the hot beverage cup is characterized by comprising an impact-resistant layer and a compact layer; The impact-resistant layer is attached to the wall of the hot drink cup, and the compact layer is attached to the impact-resistant layer; the impact-resistant layer and the compact layer are formed by kiln firing along with a hot drinking cup, and the impact-resistant layer and the compact layer are respectively prepared by taking ceramic sol as a base material, respectively mixing anti-falling fiber materials and compact powder materials and firing; The ceramic sol is prepared from the following raw materials, by weight, 40-55 parts of silicon dioxide powder, 5-10 parts of zircon powder, 2-4 parts of pearl powder, 1-3 parts of titanium dioxide, 3-6 parts of organic epoxy resin, 35-45 parts of deionized water and 10-15 parts of 75% ethanol solution; The anti-falling fiber material is prepared from, by weight, 25-35 parts of polycrystalline mullite ceramic fiber, 25-35 parts of basalt fiber, 10-15 parts of silicon carbide whisker, 2-6 parts of magnesia powder, 3-8 parts of zirconia powder, 0.5-1.5 parts of sodium hexametaphosphate and 35-45 parts of deionized water; The preparation raw materials of the compact powder comprise, by weight, 5-10 parts of potassium feldspar powder, 3-6 parts of wollastonite powder, 2-5 parts of alumina powder, 55-65 parts of kaolin, 4-8 parts of polyvinyl alcohol PVA, 1-3 parts of stearic acid and 2-5 parts of polyethylene glycol.
  2. 2. The high temperature resistant coating for the inner wall of a hot beverage cup according to claim 1, wherein the preparation process of the anti-falling fiber material is as follows: Cutting polycrystalline mullite ceramic fiber and basalt fiber to 5-8mm, and stirring at 400-500r/min for 5-10min to obtain mixed temperature-resistant skeleton fiber; Mixing silicon carbide whisker, magnesia powder, zirconia powder and sodium hexametaphosphate, adding half deionized water, and performing ultrasonic dispersion for 20-30min at the ultrasonic power of 400-500W and the frequency of 20-30kHz to obtain uniform non-agglomeration inorganic powder slurry; Adding the mixed temperature-resistant skeleton fiber into the inorganic powder slurry, uniformly stirring, slowly adding the rest deionized water, and stirring at the speed of 300-400r/min for 1.5-2h to obtain the thick uniform composite slurry serving as the anti-drop fiber material.
  3. 3. The high temperature resistant coating for the inner wall of a hot beverage cup according to claim 1, wherein the preparation process of the compact powder is as follows: mixing potassium feldspar powder, wollastonite powder, alumina powder and kaolin, and stirring at a speed of 120-150r/min for 5-10min to obtain basic powder; Mixing the basic powder with polyvinyl alcohol PVA, stearic acid and polyethylene glycol, and stirring at a speed of 120-150r/min for 5-10min to obtain compact powder.
  4. 4. The high temperature resistant coating for the inner wall of a hot beverage cup according to claim 1, wherein the preparation process of the ceramic sol is as follows: drying silicon dioxide powder, zircon powder, pearl powder and titanium dioxide in a baking oven at 100-110 ℃ for 2-4 hours, and uniformly mixing after drying to obtain dry powder; Mixing the organic epoxy resin, deionized water and 75% ethanol solution with the dry powder, and stirring at the speed of 120-150r/min for 5-10min to obtain ceramic sol.
  5. 5. The high temperature resistant coating for the inner wall of a hot beverage cup according to claim 1, wherein the particle size of the compact powder is 10-20 μm.
  6. 6. A method for preparing a high temperature resistant coating on the inner wall of a hot beverage cup according to any one of claims 1 to 5, comprising the steps of: S1, mixing an anti-drop fiber material with ceramic sol, stirring for 5-10min at the speed of 120-150r/min, and dispersing for 20-30min by adopting ultrasonic with the power of 500-600W, the frequency of 20-30kHz and the ultrasonic to obtain impact-resistant layer slurry; s2, mixing the compact powder with ceramic sol, stirring at a speed of 60-85r/min for 10-15min, and dispersing by adopting ultrasonic with a power of 250-350W, a frequency of 15-20kHz and ultrasonic for 5-10min to obtain compact layer slurry; S3, coating the slurry of the impact-resistant layer on the surface of the cup wall of the hot beverage cup by adopting a glaze brush, placing the coated hot beverage cup at a ventilated and dust-free place, drying at room temperature, coating the slurry of the compact layer after the surface of the impact-resistant layer is dried, placing the hot beverage cup in a drying oven, and performing programmed drying, namely slowly heating to 80-100 ℃ from the room temperature at 1-2 ℃ per minute, and preserving heat for 1-2 hours to obtain a cup blank; S4, placing the cup blank into a kiln, heating from room temperature to 300-400 ℃ at 1-2 ℃ per min, heating to 750-830 ℃ at 3-5 ℃ per min after the temperature is reached, preserving heat for 10-30min, and cooling along with the kiln to form a high-temperature-resistant coating on the inner wall of the hot drink cup.
  7. 7. The method for preparing the high-temperature resistant coating on the inner wall of the hot beverage cup according to claim 6, wherein the thickness of the impact resistant layer is 0.2-0.3mm, and the thickness of the compact layer is 0.1-0.2mm.
  8. 8. The method for preparing the high-temperature resistant coating on the inner wall of the hot beverage cup according to claim 6, wherein the mass ratio of the anti-falling fiber material to the ceramic sol is 0.3:1, and the mass ratio of the compact powder material to the ceramic sol is 0.5:1.

Description

High-temperature-resistant coating for inner wall of hot drink cup and preparation method thereof Technical Field The invention belongs to the technical field of hot beverage cup coating preparation, and particularly relates to a high-temperature-resistant coating for the inner wall of a hot beverage cup and a preparation method thereof. Background The hot drink cup is a special device for containing hot drink, and is usually made of high-temperature resistant materials such as ceramics, stainless steel, food-grade plastics and the like, and the cup body is designed with a heat insulation layer or a double-layer structure so as to improve the use safety; However, the inner wall of the traditional ceramic hot drink cup is of a single-layer ceramic glazed structure, the brittleness is large, no anti-falling reinforcing component is added, when the cup body is subjected to slight collision or suddenly changes in cold and heat, microcracks are easily generated on the inner wall, the ceramic breakage phenomenon occurs, and the problem that the coating falls off in large blocks is also caused when the cup body is serious. Disclosure of Invention The invention aims to solve the problems and provide a high-temperature-resistant coating for the inner wall of a hot beverage cup and a preparation method thereof. The invention realizes the above purpose through the following technical scheme: The invention provides a high-temperature resistant coating for the inner wall of a hot drink cup, which comprises an impact resistant layer and a compact layer; The impact-resistant layer is attached to the wall of the hot drink cup, and the compact layer is attached to the impact-resistant layer; the impact-resistant layer and the compact layer are formed by kiln firing along with a hot drinking cup, and the impact-resistant layer and the compact layer are respectively prepared by taking ceramic sol as a base material, respectively mixing anti-falling fiber materials and compact powder materials and firing; The ceramic sol is prepared from the following raw materials, by weight, 40-55 parts of silicon dioxide powder, 5-10 parts of zircon powder, 2-4 parts of pearl powder, 1-3 parts of titanium dioxide, 3-6 parts of organic epoxy resin, 35-45 parts of deionized water and 10-15 parts of 75% ethanol solution; The anti-falling fiber material is prepared from, by weight, 25-35 parts of polycrystalline mullite ceramic fiber, 25-35 parts of basalt fiber, 10-15 parts of silicon carbide whisker, 2-6 parts of magnesia powder, 3-8 parts of zirconia powder, 0.5-1.5 parts of sodium hexametaphosphate and 35-45 parts of deionized water; The preparation raw materials of the compact powder comprise, by weight, 5-10 parts of potassium feldspar powder, 3-6 parts of wollastonite powder, 2-5 parts of alumina powder, 55-65 parts of kaolin, 4-8 parts of polyvinyl alcohol PVA, 1-3 parts of stearic acid and 2-5 parts of polyethylene glycol. As a further optimization scheme of the invention, the preparation process of the anti-falling fiber material comprises the following steps: Cutting polycrystalline mullite ceramic fiber and basalt fiber to 5-8mm, and stirring at 400-500r/min for 5-10min to obtain mixed temperature-resistant skeleton fiber; Mixing silicon carbide whisker, magnesia powder, zirconia powder and sodium hexametaphosphate, adding half deionized water, and performing ultrasonic dispersion for 20-30min at the ultrasonic power of 400-500W and the frequency of 20-30kHz to obtain uniform non-agglomeration inorganic powder slurry; Adding the mixed temperature-resistant skeleton fiber into the inorganic powder slurry, uniformly stirring, slowly adding the rest deionized water, and stirring at the speed of 300-400r/min for 1.5-2h to obtain the thick uniform composite slurry serving as the anti-drop fiber material. As a further optimization scheme of the invention, the preparation process of the compact powder comprises the following steps: mixing potassium feldspar powder, wollastonite powder, alumina powder and kaolin, and stirring at a speed of 120-150r/min for 5-10min to obtain basic powder; Mixing the basic powder with polyvinyl alcohol PVA, stearic acid and polyethylene glycol, and stirring at a speed of 120-150r/min for 5-10min to obtain compact powder. As a further optimization scheme of the invention, the preparation process of the ceramic sol comprises the following steps: drying silicon dioxide powder, zircon powder, pearl powder and titanium dioxide in a baking oven at 100-110 ℃ for 2-4 hours, and uniformly mixing after drying to obtain dry powder; Mixing the organic epoxy resin, deionized water and 75% ethanol solution with the dry powder, and stirring at the speed of 120-150r/min for 5-10min to obtain ceramic sol. As a further optimization scheme of the invention, the particle size of the compact powder is 10-20 mu m. The invention also provides a preparation method of the high-temperature-resistant coating on the inner wall of the ho